UHS-3 U3 transfer speed rate in microSDXC Extreme cards (SDSDQX-064G-U46A) - Are they UHS 3 or 1?

Hi there, This is a question for SanDisk engineers (hope Dr. Lucky , the wise SanDisk master can respond :-) The question is regarding the SanDisk microSDXC Extreme , part number is SDSDQX-064G-U46A and EAN code is 619659096014.
Looking at the front of the blister you can see UHS-1 (U1) labelled at the blister and also at the microSD card , I know that SanDisk has launched another serial of the same card with UHS-3 (U3) enabled , but at this time all the official SanDisk suppliers in the EU only have in stock the UHS-1 version. The prroblem is that the official pictures provided by SanDisk (Aprimo portal) appears the UHS-3 not the UHS-1 as the stock I have. I´ve got a customer that complains about the UHS-1 transfer rate as he needs the card for 4K recording, I know that 4K recording is valid with UHS-1 cards as well. I´ve seen that Amazon has listed the UHS-3 (U3) version, and I wantedf to know if the card is the same despite the blister shows UHS-3 (U3) or UHS-1 (U1). As far as I understand i think the card is the same as the read speed of 80MB/s appears in both versions (U3 and U1). Could you please clarify if there are 2 different versions of the mpn SDSDQX-064G-U46A? I guess this is a SanDisk commercial issue and the card is the same but I want a official response from SanDisk in oder I can clarify to my customers. In the past SanDisk launched many different versions of the same card (i.e. the microSD Ultra 64GB, android versions..etc..) This is a picture of the UHS-1 version : And this is a picture of the UHS-3 (U3) version: Thanks in advance for your response, Eduardo (MemoryVal)

Hi memoryval,
The change fro U1 to U3 was a blind roll and the SKU has not changed. The cards are the same in reference to speed the only change was from U1 to U3. Unfortunately from a part number ordering perspective you will not be able to distinguish the newer U3 cards from the older U1 cards.
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If I transfer content from an iPad backup to a new iPad, are they synced, or can I change one without changing the other?

I have just bought a new iPad mini to use alongside my iPad Air. They'll be used in much the same ways, just the mini being slightly more portable and the Air having a bigger capacity will have more content.
I'd like to set up my new mini from a backup of the Air (currently the Air doesn't have too much content that the mini will not have enough capacity), but then I'd like them to go their separate ways. I'd like the mini to look how the Air currently does, but then I'd like to make tweaks to both of the devices, but in different ways to each other. So, if I set up from back up and then delete an app or 2 off one, will it delete the apps off the other?
I assume they show up in iTunes as "iPad" and "iPad mini" or something different so I can use both devices with my Apple ID?
Or is it better to just set up from new and sync the bits I want to my new mini using iTunes. That doesn't seem like it'd take so long, so might be easier?
Thanks!

You can restore the Air's backup onto the Mini - if not already in your computer's iTunes library then copy them over from the Air via File > Devices > Transfer Purchases (your iTunes downloads aren't included in a backup, the restore picks them up from your iTunes library).
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V. Slow transfer speeds with new dual band Airport Extreme

I have a new Airport Extreme (late 2009, dual band, full 'N' spec) which I am using to replace an older Airport Extreme (early 2008, 5Ghz, 'draft' N).
I have a USB disk attached and was interested in benchmarking the transfer speed of the new Extreme, compared to the previous version. The results are puzzling / alarming.
Shown below are transfer speeds (file copied to the attached USB drive) under different connection standards (2.4Ghz / 5Ghz & a/b/g/n)
'Old' Airport Extreme
5Ghz - 'draft' N : ~5-7 Mb/sec
'New' Airport Extreme
2.4Ghz - b/g : ~3-5 Mb/sec
5.0Ghz - a : ~3-7 Mb/sec
5.0Ghz - N : ~200 Kb/sec
Hence transfer speeds appear to collapse when I try to make use of the 'N' spec with the latest Extreme. I have tried altering items such as - wide channels (on / off), interference robustness (on / off), 5Ghz channel (manual, instead of auto), with no upside.
I seem to be at the point of concluding that either
1. I have a 'broken' Airport Extreme
2. The WiFi card on my early 2008 iMac (which implements I guess the 'draft' N standard) is 'incompatible' with new the Airport Extreme under a 'N' connection.
Any thoughts ?

Since all devices in my wireless network are capable of latest 802.11n protocol, I really do not need older and slower 802.11a/b/g protocols. To achieve above 200 Mbit/sec, 5GHz band with wide channel option turned on is really necessary. Thus I really wish I can turn off the 2.4GHz radio band (seems Apple has set this band as default) of my new dual band Airport Extreme to avoid unwanted bandwidth degradation. Unfortunately this is not possible with radio mode setting in Airport Utility.
The best I can do to force connection with 5GHz radio band (with quite consistent result) is as follows:
On Airport Extreme through [Airport Utility>Wireless] :
Radio Mode: 802.11n only (5Ghz) - 802.11b/g/n
More Options>Wireless Network Option>Transmit Power: 100%
More Options>Wireless Network Option>Use Wide Channels: checked
More Options>Wireless Network Option>5 GHz Network Name:
checked and same network name with extra suffix "(5 GHz)"
On 27" iMac through [System Preferences>Network>AirPort>Advanced>AirPort]:
Preferred Networks:
Create only one profile in Preferred Networks for the above network name with suffix "(5GHz)"
Uncheck the option [Remember networks this computer has joined] to ensure there is only one profile under Preferred Networks .
Once all above settings are done, restart Airport Extreme in Airport Utility. Your computer should connect wirelessly to the base station through 5GHz band after booting most of the time. Even when it is not occasionally, simply go to the Airport icon in main menu bar and click on the network name with suffix "(5GHz)" in dropped-down list to connect manually. With all these settings, I have achieved 300 Mbit/sec bandwidth on my iMac most of the time for fast Time Machine backup.
How I wish feature for better radio mode control by end user will be implemented in next update of Airport Utility. Apple should trust end user's brain better than artificial intelligence (or ignorance ?) in wireless network implementation. Wireless traffic between the two radio bands and among various wireless devices should be segregated specifically in Airport Utility by end users whenever dual band Airport base stations are in use.

Very slow transfer speeds with external hard drives through Firewire and US

Hi All,
My external drives transfer very slowly on my MacPro. I've been searching for answers and have turned up very little. Apple support suggested I post my issue here. Just to make a note, I measured my disk speeds with both AJA System Test and copying files between drives and reading the Disk Activity in Activity Monitor.
I have 3 external drives, all MyBook Premium or Professional, 1x 500GB, 1x 1TB and 2x 1TB in RAID 0. I had them on Firewire 400 and the RAID 0 2TB one on Firewire 800. My transfers on FW were all around 24MB/sec on all drives (much less than what I should be getting with FW400). I then read somewhere that the FW bus on the MacPro uses the slowest speed connected for all FW connections. So I unplugged everything but the FW800 Raid 0 drive and my transfer rate jumped to 40-60MB/sec. This is much better, but still about half or so of what I expect it should be producing from an external RAID 0 setup.
To keep my FW800 backup drive faster, I've plugged the other two into USB2.0. The transfer speeds on both drives are now hideous, around 10-15MB/sec. This is so slow, but I'm not sure what to try to fix my speeds.
The HD's in the external drives are all 7200rpm, and all should be transferring at a higher rate. Do you have any suggestions or ideas? Ideally I'd like to get everything transferring at rates they should be transferring at, but I'll settle with my current FW800 speed of 40-60MB/sec if I can get my other two drives transferring at a non-snail pace.
Is this a common issue? I can't believe I'm the only one plugging multiple external hard drives into their Mac Pro. I hope someone has a fix or solution for this. I'm all ears!
Thanks in advance.

Hi Kappy, thanks for the information.
So I rejigged my setup a tad. My RAID 0 is still FW800, the second drive is back on FW400 on the back port, and the third is USB 2.0 on the back as well.
It's interesting to note that I saw the FW800 taking a bandwidth hit if the FW400 drives was being read/written to. For example, if I was averaging 50-60MB/sec on the FW800 drives and copy something large to the FW400 drive, each drive averages out to about 30/MB second, roughly half the FW800 speed I was getting. The USB while the slowest didn't cause any slowness on the FW drives.
Here are my Xbench results. These results are from each drive being benchmarked individually with no other drives being tested at the same time.
*MyBook 2TB in a RAID 0 configuration: Firewire 800*
Results 75.42
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD My Book
Disk Test 75.42
Sequential 80.92
Uncached Write 69.16 42.46 MB/sec [4K blocks]
Uncached Write 110.79 62.68 MB/sec [256K blocks]
Uncached Read 53.66 15.70 MB/sec [4K blocks]
Uncached Read 136.76 68.73 MB/sec [256K blocks]
Random 70.62
Uncached Write 36.38 3.85 MB/sec [4K blocks]
Uncached Write 140.55 45.00 MB/sec [256K blocks]
Uncached Read 93.26 0.66 MB/sec [4K blocks]
Uncached Read 88.38 16.40 MB/sec [256K blocks]
*MyBook 1TB on Firewire 400*
Results 47.73
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD My Book
Disk Test 47.73
Sequential 52.47
Uncached Write 48.45 29.74 MB/sec [4K blocks]
Uncached Write 53.76 30.42 MB/sec [256K blocks]
Uncached Read 43.69 12.79 MB/sec [4K blocks]
Uncached Read 70.91 35.64 MB/sec [256K blocks]
Random 43.78
Uncached Write 17.29 1.83 MB/sec [4K blocks]
Uncached Write 98.83 31.64 MB/sec [256K blocks]
Uncached Read 76.33 0.54 MB/sec [4K blocks]
Uncached Read 97.01 18.00 MB/sec [256K blocks]
*MyBook 500GB on USB 2.0*
Results 40.60
System Info
Xbench Version 1.3
System Version 10.5.5 (9F33)
Physical RAM 16384 MB
Model MacPro3,1
Drive Type WD 5000AA External
Disk Test 40.60
Sequential 35.99
Uncached Write 37.31 22.91 MB/sec [4K blocks]
Uncached Write 37.22 21.06 MB/sec [256K blocks]
Uncached Read 26.62 7.79 MB/sec [4K blocks]
Uncached Read 50.27 25.27 MB/sec [256K blocks]
Random 46.55
Uncached Write 20.37 2.16 MB/sec [4K blocks]
Uncached Write 68.44 21.91 MB/sec [256K blocks]
Uncached Read 93.55 0.66 MB/sec [4K blocks]
Uncached Read 86.71 16.09 MB/sec [256K blocks]
So Kappy are you saying that those speeds look normal?
Thanks

External firewire hard drive reverts to slower transfer speeds

This is the strangest hardware problem I've come across. I'm running a unibody mbp (June 2009) with an external WD 2.0TB Caviar Green drive mounted in a firewire 800 enclosure made by icydock.
Lately, I've noticed that after an unknown amount of uptime, the speed of file transfers to the WD external drive slows down dramatically. I figured this out by watching my time machine transfers take a bit longer after awhile, and I verified this using aja system test and speedutilities.
When I boot my mbp in the morning, file transfers and time machine backups to the external WD transfer at a rate of about 67-75MB/s. This is the speed the drive should always be working at since it's connected via firewire 800. Aja speedtest verifies the speed is as it should be as well.
Then, after a couple hours of using my mbp, or even later in the day, I'll transfer a file to the external WD or run a time machine backup and find that the transfer will only run at a max of 29-35MB/s. This is exactly half the speed the transfer should be going at. Subsequent transfers stay at this slower rate no matter what I do.
However, I've been able to fix this problem by unmounting and remounting the external WD or restarting my mbp. After doing either of these actions, the WD external goes back to contant transfers at 75-80Mbs. So something is happening where the longer the mbp is running, or after some sort of disk activity, the external WD reverts to a slower transfer speed (closer to FW400). I can't isolate whether it's an issue on the mac os side or the hard drive or the hard drive enclosure because I can make the hard drive go back to optimal speed again merely by unmounting and remounting it. This works consistently until a few hours later when the drive begins to handle transfers at half speed again.
I run hourly time machine backups to the drive. The time machine backups can't be the culprit because the drive remains running at optimal speed after the backups (verified with aja system test and speed utilities)
Any possible ideas as to why the drive cuts down to half its optimal transfer rate after a bit of time? I can't figure out the cause of this, and the consistency of the drop leads me to think this is an issue with the power management on the drive since it reverts to full fw800 speed when I umount and remount the drive or restart my computer. Could this be an OSX issue where for some reason the system isn't negotiating the fastest speed?
Any help appreciated.

From the SoftRAID manual:
Fire hubs and disk drives. FireWire hubs are notorious for introducing errors and instability onto the bus.
Make sure that all of your consumer electronic devices (iSight, cameras, scanners) are connected to a separate FW bus. These devices are not built to the same standards as storage devices and known for introducing errors onto a FW bus.
Cables. While most cables work fine with a single device, many cables will introduce errors when 2 or more disks are connected to the bus.
http://www.softraid.com
http://www.softraid.com/demo.html - manual and demo
Output can be to any drive or partition. When you lauch iMovie it asks where to store your project.
I just bought a camera, and curious myself to see if I can take 10 minute clips and use iMovie/iDVD so that it will auto-play. I may end up buying Pogue's "iMovie Missing Manual" or something.
iMovie Discussions

Transfer speed and other minor bits

First off - I love my iPod (40g Colour) and despite my regular bouts of impatience when updated, loading etc I am very happy with the thing. I even bought my wife a shuffle and she likes that for when she's at the gym. I found the software/hardware to be very forgiving.
However I thought I'd post a query to see if anybody had any ideas on my minor problems.
1) When we loaded my wife's shuffle for he first time we had problems with the USB 2 convection. PC keeps saying "this item can run faster connect to a USB2 ....." but it is connected to a USB 2 socket. Now everytime I attach either iPod the same warning comes on (except if I connect before starting!). I know its a USB 2 because a new board was fitted a while ago and my 40g will synch and charge on the connection.
2) Slow transfer. I recently loaded iTunes 5.0 which didn't work for me (see 3). So I wiped it and loaded a copy of 4.9 (thanks to filehippo). Im up and running again but had to re-synch my iPod to iTunes. The tranfer rate is about 500 tracks per hour so to do the 8500 that my iPod takes needs 17 hours. When its done I should'nt need to do it agin for a while but could I speed things up a bit?
3)Should I go to iTunes 5.0.1? 5.0 loaded on my PC fine without all teh problems that have filled these oages recently but when in 5.0 I connected either iPod (shuffle or 40G I got an error somthing like "Ipod not recognised re-intall iTunes". I know some other people had a similar problem. iTunes 4.9 is working fine but is it safe for me to try 5.0.1 yet?
Sorry to go on a bit but I know from watching these forums recently there are some very knowledgeable and helpful people out there so I hope you don't mind my request.

I've had some news - most of it good. I got fed up with the transfer speed so I took my box into my local store to get it checked out. No visible fault on my USB 2.0! I know it happens but they couldn't replicate it so I went home. Plugged all my stuff in except USB devices. Plugged in my iPod and it worked. I was now thinking about power requirements etc. Plugged in my USB modem and the iPod still updated at USB 2.0 speed. Next I tried my wife's shuffle - so far so good. I then plugged everything in and the iPod defaulted back to USB 1.1!
Tried the shuffle in the spare USB2.0 socket and it worked. Plugged my iPod in and that worked - Now I knew what the problem was - I only have 3 USB 2.0 sockets (5 USB1.1)and two had faulted.
Next step will be a new card with a fire wire socket! Happy Days - although I still cant get an extension cord to work with my iPod.
While I was on a roll I took the bull by the horns and loaded iTunes 6.0. Works like a dream although it is a bit slower than 4.9 - probably considerably bigger but it works!!
My turn to be the lucky one this week!!! Maybe your turn next.

Too slow transfer speed for Toshiba 3.0

Hi there
i just purchased a toshiba 3.0 external hdd.
I use windows 7 genuine.
My pc specs are pretty ok cos i am able to run heavy games like crysis 2.
The problem is, My external hdd has slow transfer rates. This problem i started facing aroung 3 months ago. My hdd is out of warranty.
My USB ports are ok and i connect it to primary port.
The transfer speeds are just around 10MBPS and sometimes it drops to KBPS!!!!
Also, it does not copy some files and gives error "Failed to read from source disk" or something like that.
There is no Virus in it, I have enabled write-cache. I have defragged it.
My OS is fine and also, i checked it on other OSes.
Also, i have tried using "check disk for errors" with proper procedure but it hangs somewhere in the middle after it processes 500000 sectors or so.
I got my HDD from my cousin as he no more used PC and without any cover so i dont have any idea of model (although if there is any utility to find model then please notify me).
Also, it worked fine during then. Me and my cousin are from India only.
How can i fix this issue?
Please help me.
Message was edited by: Jaskaran
null

Please dont understand me wrong but if the case is urgent call Toshiba hotline in your country or contact nearest Toshiba service provider.
This is user-to-user forum only.

What transfer speed can I expect via wired ethernet?

3 iMac's wired to an AirPort Extreme....what transfer speeds should I expect? I'm only getting 40-60MBps IMac to IMac via Ethernet provides up to 70MBps. I am wanting to get a Thunderbolt Drive but worry that while the iMac that the Thunderbolt HD is plugged into will get much faster transfer rates, when access the Thunderbolt HD from another iMac on the network I will still be stuck with the 40-60MBps rate. Surely there is a way to get faster network speeds than 40-60MBps?

Tesserax, You are are correct, I was just hoping that there was some way to get better performance out of my network speed so that the $1500 Thunderbolt purchase was worth it. What I now plan to do is get the $999 model R4 4-1TB just so I can have one since the iMac that the Thunderbolt HD will be plugged in to will be doing the most editing so in some ways it does help me....just not as much as I was hoping it would. I can at least take my old FireWire HD and plug it into my iMac and use that for FCPX projects that are for more personal than business use.
Having only 1 HD that 3 iMac's can use to edit images from has really helped me out with keeping everything in order.
If you can daisy chain the Thunderbolt Drives I have to wonder why they didn't have it so 2 iMac's couldn't connect to 1 HD. With 2 Thunderbolt ports on the iMac you would think you could connect iMacs together using 1 port on each then have the other port for like HD's, extra screens, etc You know what I mean? If you are going to make this super fast port/cable you might as well make it to connect iMacs as well.

Internal Disk to Disk Data Transfer Speed Very Slow

I have a G5 Xserve running Tiger with all updates applied that has recently started experiencing very slow Drive to Drive Data transfer speeds.
When transferring data from one drive to another ( Internal to Internal, Internal to USB, Internal, Internal to FW, USB to USB or any other combination of the three ) we only are getting about 2GB / hr transfer speeds.
I initially thought the internal drive was going bad. I tested the drive and found some minor header issues etc... that were able to be repaired so I replace the internal boot drive
I tested and immediately got the same issue.
I also tried booting from a FW drive and I got the same issue.
If I connect to the server over the ethernet network, I get what I would expect to be typical data transfer rates of about 20GB+ / hr. Much higher than the internal rates and I am copying data from the same internal drives so I really don't think the drive is the issue.
I called AppleCare and discussed the issue with them. They said it sounded like a controller issue so I purchased a replacement MLB from them. After replacing the drive data transfer speeds jumped back to normal for about a day maybe two.
Now we are back to experiencing slow data transfer speeds internally ( 2GB / hr ) and normal transfer speeds ( 20GB+ / hr ) over the network.
Any ideas on what might be causing the problem would be appreciated

As suggested, do check for other I/O load on the spindles. And check for general system load.
I don't know of a good GUI in-built I/O monitor here (and particularly for Tiger Server), though there is iopending and DTrace and Apple-provided [performance scripts|http://support.apple.com/kb/HT1992] with Leopard and Leopard Server. top would show you busy processes.
Also look for memory errors and memory constraints and check for anything interesting in the contents of the system logs.
The next spot after the controllers (and it's usually my first "hardware" stop for these sorts of cases, and usually before swapping the motherboard) are the disks that are involved, and whatever widgets are in the PCI slots. Loose cables, bad cables, and spindle-swaps. Yes, disks can sometimes slow down like this, and that's not usually a Good Thing. I know you think this isn't the disks, but that's one of the remaining common hardware factors. And don't presume any SMART disk monitoring has predictive value; SMART can miss a number of these cases.
(Sometimes you have to use the classic "field service" technique of swapping parts and of shutting down software pieces until the problem goes away. Then work from there.)
And the other question is around how much time and effort should be spent on this Xserve G5 box; whether you're now in the market for a replacement G5 box or a newer Intel Xserve box as a more cost-effective solution.
(How current and how reliable is your disk archive?)

Wireless transfer speed is hopeless!

Hi,
New BT customer here, after being with aol for nearly 10 years I thought it was time for a change. Why-o-why?
I used to have a netgear 834g router which worked fine, signal would drop a touch upstairs and broadband 8mb with aol, but they could not offer me an all-in package, Wireless transfer speed of 54mbps with a netgear wv111v2 g adapter.
So I decided to change to BT(07/06/2010) to have it all under one roof, Total Broadband they call it, Total **** I call it.
Since the changeover my wireless transfer speed upstairs will be lucky to achieve 24mbps and the signal is shocking ranges from low to can't be bothered. So, I bought a new Belkin 'N' F5D8053v6 adapter to achieve best range and speed. No change in fact, it is worse than the old adapter, Dodgy adapter maybe? No, because I then bought the singing n' dancing Netgear N 300 mbps Wn111v2 adapter and it is still rubbish 24mbps max.
I am not a computer nerd, but I can set up a network after going through all this before, having two kids who are computer nuts sees to that.
I have changed/reinstalled everything, changed the channels; WEP, WPA-Sk; refitted old adapter, sat on top the BT hub; scoured forums, all to no avail the signal and transfer rate is still the same.
Off to India it was, to have the mis-fortune of speaking to one of the most rude, abrasive customer service personel. They would not listen to what I told them, accused me of entering the wrong password; ignored me on the phone whilst talking to someone else, done some checks remotely whilst I was still on line and said the speed was the best I could achieve, after an endless amount of time on the phone, It was the brick wall with open doorway between me and the hub 5 yards away causing the drop. All non believable.
Well I have just come off the phone and it's still the same, I have had to change the channels 5 times since to try and get a constant signal.
The BT hub say tranfer rate of 130mbps when I only have 24mbps according to my adapter, so who is lying?
My line is fine, I live less than 2 miles form exchange and if I connect through ethernet I get 6.5mb, wireless it drops to 2.5mb upload 0.4mb.
Please BT come and take this useless equipment away and I will go back to aol's basic kit. I won't hold it against you, but it is far superior in every way.

herbie9 your own post said that and I quote "I used to have a netgear 834g router which worked fine, signal would drop a touch upstairs and broadband 8mb with aol, but they could not offer me an all-in package, Wireless transfer speed of 54mbps with a netgear wv111v2 g adapter." Like Sweeney47 says use that and just configure it for BT access. Plenty of links in here to help with that. The only other answer for you will be to use a powerline adpater pair to another WAP upstairs and that will give you the signal downstairs and up. should be able to pick up a cheap WAP for under £20 and the powerline adpaters vary but I have seen them for £30 and up. Quality counts on the powerline though. Must be an enviromental issue regards wireless signal.

Transfer speed to Airport Disk?

I have a 300GB LaCie connected to the USB2 port on my Airport Extreme Base Station. So far, this arrangement seems to be working fine in Leopard--but I'm wondering if the data-transfer rate is abnormally slow.
I have the Wireless Radio Mode set to 802.11n (802.11b/g compatible) (unfortunately, I can't go 802.11n only, or my TiVo can't connect), and the iMac I'm on is only a few feet away from the Base Station. I'm transfering a 3.5GB iMovieHD file from the iMac to the 300GB LaCie right now, and the total transfer time is about 42 minutes. Does this seem normal?

There's a bit of confusion in this thread about speeds.
Data transfer speeds are sometimes given in MegaBITS per second Mb/s and sometimes given in MegaBYTES per second MB/s. (it's easy to get them confused)
The Airport Extreme's wireless is rated at 270Mb/s.
That number does not reflect real world use (but all manufacturers use the theoretical value) What it means is that this is the maximum number of bits per second going in both directions including all the overhead stuff.
What is the maximum real world speed? In the real world the best speed you'll see copying a file from one place to another is 10MegaBYTES per second. This is very fast wireless very similar to wired ethernet. It can only be achieved when the Airport is set to 5GHz radio mode.
The USB hard drive does not achieve this speed. The CPU in the base station struggles to cope with files systems and the drive. So reading and writing you get between 3 and 6 MegaBYTES per second. The same drive would be 4 or 5 times quicker if it were plugged into your computer.
Using a NAS is faster. But this is plenty fast enough for streaming HD videos.
Jon,
Your speed is about half the regular speed for copying. Not massively slow but slower than I'd expect.
Try connecting at 5GHz n-only.
And use the graph device in Airport Utility to see if you have a poor signal strength.

Transfer speed in Target Disk mode

This may not be a question as I am not even interested in the "why" any more.
My MBP (2.0GHz, 2GB Ram, 7200rpm HD, Week 15) is in target disk mode, and I am copying my Aperture Library (50GB) over to my PowerMac G4 via firewire. Obviously the firewire ports on both sides are Firewire 400, but the file transfer speed appears to be noticeably slow compared to a similar transfer between my external hard drive and the PowerMac G4.
When I copy over the exact same library (50GB, about 40,000 files according to Finder) from the external HD to the PowerMac, it takes less than 40 minutes. Now between my MBP and PowerMac G4, Finder estimates more than 2 hours.
I am curious why this is the case when both the external HD and my MBP have 7200rpm drives. Has anyone noticed this too?

Disks aren't (usually) rated by read/write speed, at
least not by the manufacturers. They sell by
capacity.
You’re kidding, right? Drive manufacturers specify transfer rates, average, minimum and maximum seek times. Rotational latencies and cache buffer sizes. All these parameters are direct measures of performance, and people who design and build systems pay close attention to them. I know I do. I’ve been putting 10,000 RPM Ultra-160 and now Ultra-320 SCSI drives and dual-channel SCSI adaptors in my Linux desktops for several years, now. These parameters have a large effect on performance, obviously.
It's not a question of 'consider', it's a question of
verifiable fact - data on the inner part of the
spindle cannot be written or read as quick as data on
the outer part. …
If you cannot tolerate the minimum speeds, then you cannot use that part of the drive. If you’re going to use the full capacity of the drive, you won’t get the speed. You are forced to de-rate the drive one way or the other.
That’s what I’m saying.
In other words, if you’re going to use the whole drive, then you’re going to get the speeds you get. Avoiding filling it is not really an option, is it?
Randall Schulz

How do I see file transfer speeds?

Hey guys, does anyone know if it's possible for me to see file transfer speeds instead of just the time remaining in Finder?

Hi,
In song view, go to menu > view > view options and select bit rate, file type and size.
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Create playlist based of file type being lossless.
Jim

NI8451 SPI data transfer speed and SCLK setup time adjustment

I'm using NI USB-8451 SPI bus to do communication. I can not reach the speed of communication 4MHz (NI USB-8451 module advertises speeds up to 12MHz). Actrually the data transfer speed is much slower than 4/8 Mb/s. The 16k*16bit data cost around 800ms while it should be 128ms if the data transfer achieves 4Mhz speed. In the manual there is a SPI timing clock figure like this:
In the 4Mhz communication case, the t2 should be 0.25us. I wonder whether the low data transfer speed is due to t1,t3 and t4 since they occupy too much "dead time". If my guess is right, is there any method to reduce the t1,t3 or t4, espetially t3? I know that in the advanced API there is a way to add delay while I did not figure out how to reduce delay(t3). If my guess is wrong, what is the exactly maximum data transfer speed NI8451 can support? (not the clock rate)
Thanks for help.

Hi everyone. Im using the SPI communication with 8451 and Im having the same situation., since the serial flash memory I need to program is big enough, t3 (SCLK Setup time) and other "dead time" which I think is the time when buffer on the 8451 needs to be re-filled those are killing my expectation on the final results. I can't see a way to decrease t3 (~10uSec) and in the same way Im seeing something like buffering up to 100~110 bytes then, a ~1.5mSec delay appears on the signal waveforms. Did somebody have good results trying to avoid this?
Thank you.
Javier
Attachments:
t3 - SCLK setup time.jpg ‏156 KB
Data byte Transfer_109.jpg ‏137 KB

Ext HDD transfer speed

I just bought a WD Mybook 160gig external hard drive with a USB connection yet the speed of the transfer is rediculously slow from the powerbook to the HDD.
ie: It took 4hrs to transfer about 10gigs of music. It also took about 3.5hrs to rip a full length dvd movie(~9gigs) to the external HDD.
From what I gather, it should not take that long to transfer items to an external drive. I was told that it was possible to rip a dvd in less than 30 minutes.
So if anyone would be able to provide me with some help, advice or what not with increasing date transfer speed, I would be greatly appreciative.
thanks in advance

Welcome to Apple Discussions!
First off, the rate of speed you are getting is typical of USB 1.1. USB 2 was not introduced in Macs until June 2003 with the PowerMac G5, and later with the rest of the Mac lineup in September and October 2003.
If you want faster speed move the hard drive out of the USB case and put it in a Firewire hard drive case (if the MyBook isn't one) such as those by Relax Technologies ( http://www.granitedigital.com/ ) or http://www.macsales.com/
If the MyBook has Firewire, use that instead of USB.
PCMCIA to Firewire and PCMCIA to USB 2 adapters also exist, but usually don't supply power to the drive, and are limited to 20 MBps. Better than the 12 Mbps of USB 1.1 which is limited to if no other items are on the USB bus. If other items are on the USB bus, then you will only get the speed of the slowest item on the bus. Use Apple menu -> About This Mac -> More Info to launch the System Profiler and discover what is on the USB bus by selecting USB in the Hardware section of the System Profiler.

UHS-3 U3 transfer speed rate in microSDXC Extreme cards (SDSDQX-064G-U46A) - Are they UHS 3 or 1?

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