Will only support one USB drive at a time

Background
This is happening with a Mid 2007 Mini, OS X 10.7.4.
I use this Mini soley as an iTunes music server. The OS is on the internal drive. Music is on a separate drive, as is Time Machine. No keyboard is connected. I do all maintence wirelessly via screen sharing from another Mac.
Recently I changed the drives from conventional ext. FW hard drives to ext USB SSD. The USB enclosures are USB2/3 "Hornet" brand. The SSDs are Samsung 256GB 830s.
The Problem
Only one USB drive will stay mounted at a time. Both drives will initially mount but once one is put into use, i.e., play a song or start a Time Machine update, the other drive will unmount and I get the nasty "You disconnected your USB drive improperly...." I've seen the threads on USB drives randomly unmounting. This is not that issue. My drives do not randomly unmount; one will unmount as soon as the other is in use. (The unmounted drive stays unmounted. It does not remount when the other drive is no longer in use).
The drives came with USB cables that had dual ends, one for data/power the other power only. The problem occurs regardless of whether I use just the data/power or both.
My initial thoughts are:
1) It's a power issue and the Mini can't support the power requirements of both drives simulateously. I need an A/C adapter.
2) It's an incompatible enclosure (even though it said Mac compatible, who knows if it was actually tested and not just presumed).
3) Crappy cables.
The Question
Since testing any of these hypothesis will cost me $ (and time to buy -- and return if unsuccesful) I'm hoping someone here has experienced something similar to guide me to the fix a bit quicker. Am I close here, or could it be something else?

I believe Bus powered drives are for the birds, & more often a problem on Macs than PCs, get a good AC powered USB hub... or two.

Similar Messages

Windows Server 2012 R2 Essentials will only recognize 1 USB drive at a time in primordial pool

I have a new install of Windows Server 2012 R2 Essentials. I added 2 identical 2TB Seagate Expansion USB drives. Initially they had a volume on them, so I deleted the volume in order for them to be added to the primordial pool and storage spaces,
etc. They both show up fine in Disk Management, but only 1 of them at a time will show up in the primordial pool. I have tested moving them to different USB ports, trying only 1 disk at a time to ensure that both are good, rebooted, attached them via
a USB hub... but nothing works. In my most recent test I plugged in only one and did a rescan. I see it as Disk 1 in both Disk Management and Primordial pool. Then I added the second drive and did a rescan, it showed up as Disk 2 in Disk Management
and when I did a refresh in storage spaces, I can see that it changed to only see disk 2 in the primordial pool. What can be causing this?

To use USB disks, each disk must be plugged into a differs USB controller. A hub will obviously be on one controller, so that won't work. But many computers have only one or two controllers on the motherboard and then use port multipliers (basically internal
hubs) to support more ports. So you have to know your motherboard and which ports are on which controllers. And again, only one drive per controller.

Buying External Drive that Only Needs One USB Port?

The optical drive on my 2007 MacBook Pro has been dead for about 6 months. I need to get an external one so I can install some software, but I am having trouble finding one that only uses one USB port, as there is only one on each side of my notebook. I went to Best Buy today, and the only one they had that is compatible with a Mac needs two side-by-side USB ports.
Does anyone know of any good Mac compatible external drives that only require one USB port? I am interested in purchasing one by LaCie, but their site does not specify how many USBs it requires.
Any advice you can give me will be greatly appreciated!

Welcome to Apple Discussions!
You might want to consider a FireWire powered optical drive:
http://eshop.macsales.com/shop/firewire/optical-drives/
A FireWire port will deliver more power, so you would only need to use one FW port. The people at OWC are very Mac knowledgeable and could help you to pick one out. Your 2007 MBP should have both FW400 and FW800, so you could use either port.
Good luck!

Photos in my from my iPhone have same numbering as photos from my dig camera. They all go into iPhoto fine but when I backup to my ext hard drive it will only save one with the name IMG 1002 and I have two separate images both with that name. Help?

Photos in my from my iPhone have the same numbering as photos from my digital camera. They all go into iPhoto fine but when I backup to my ext hard drive it will only save one with the name IMG 1002 and I have two separate images both with that name. How do I get them all to save on my ext hard drive and hope do I prevent this numbering overlap in the future? I'm really hoping I don't have to go through and manually rename every single picture. Thanks.

How are you backing up the photos? The best way is to backup the library itself as that will preserve your organizational efforts as well as all metadata like keywords, titles, faces, places, books, etc.
You can use a backup application that does incremental backups. Thus only the first backup is a full one and subsequent backups just copy those files that are new or changed. I use Synk Pro. The lower cost version, Synk, will do the same job. Other similar apps can be found at MacUpdate.com.
OR: upload your camera to a folder on the Desktop. There you can rename the files to something that is more informative than just the file name. I use the date (international format) along with a brief desc: 2007-1-20-adian1stbday-001.jpg. File renaming apps can also be found at MacUpdate.com. Also you can give the folder an informatve name which will become the Event name when you import the folder of photos into iPhoto.
OT

How do you connect a usb printer and usb external hard drive to the airport extreme, as it only has one usb port?

I'm thinking about upgrading my old 802.11g router for a new airport extreme. Can it connect to a usb printer and external hard drive at the same time and acutally work. It only has one usb port on the back.
thank you!

To add multiple USB printers and/or HDDs, you just first need to connect a USB hub (powered prefereably) to the AirPort's USB port, and then, add the USB devices to the hub.

HT1670 Sync iPhone/Entourage will only recognize one of my two iPhones?

I have two iPhones. One I have managed to sync no problem, but the second is just not interested! A friend told me that with iPhone/Entourage will only recognize one iPhone, if so is there anything I can do to sync my second phone?

Hi, Darcie13.
Thank you for visiting Apple Support Communities.
If your device is not recognized by iTunes, I would recommend the steps in the article below. Start with the section labeled Verify that the Apple Mobile Device USB Driver is installed > For Windows Vista, Windows 7, and Windows 8 > If the Apple Mobile Device USB Driver is not listed.
iPhone, iPad, or iPod touch not recognized in iTunes for Windows
http://support.apple.com/kb/TS1538
Cheers,
Jason H.

Backing up from one USB Drive to Another

I have two WD USB drinves that I use for my photos, one as the primsary drive,the other as the backup. When these were connected to my Windows PC I could use Western Digital's WD Anywhere Backup software to provide an "instantaneous" back up of any of the photo files that I hadd added / changed on my primary drive. This worked like a charm. Using the software with my USB drives connected to me MacBook Pro . Mavericks laptop the software thinks that it is working perfectly but is not backing up all the files. On a test I specified a folder with 40+K files and 240GB of data as the folder to be watched and backed up. The software reported a successful backup but only 11K files and 60GB of data had been transferred. I reported this to WD who indicated that the software is designed to back up from the coputer's hard drive to a back up frive, not from one external drive to another.
My question is: Does anyone know of any software that will run as a daemon and automatically back up new / changed files from one USB drive to another? Obviously I could do this with any of a multitude of products if I scheduled hourly/daily backups. However, I would prefer the convenience of "instantaneous" backups as soon as a change is made within a watched follder. From what I have read Chronosync seems to be the best backup software for Macs but, as one reviewer noted (http://www.macworld.com/article/2011101/review-chronosync-4-3-5-a-multitalented- file-sync-and-backup-tool.html) "I would like to see ChronoSync go one step further and offer an option found in some other sync software: the ability to watch specified folders and synchronize changes as soon as they occur rather than waiting until the next scheduled run." Can anyone point me to the "other sync software" that offers this capability?
Thanks in advance
Brian Catterall

SOLVED
Once I got Time Machine to perform totally new backups it picked up the new external drive containing my images.
John

Laserjet 2100 will only print one page at a time.

I recently acquired a second hand Laserjet 2100 Series. Installation was fine but it will only print one page at a time, I have to keep pressing the 'Go' button, which is very frustrating. The manual tells me that it is in 'Manual' mode but not how to change it. Can anyone help, please? O/S Windows 7. Thank you.

This seems to be a commercial product. For the best chance at finding a solution I would suggest posting in the forum for HP Business Support!
You can find the Commercial Laserjet board here:
http://h30499.www3.hp.com/t5/Printers-LaserJet/bd-p/bsc-413
Best of Luck!
You can say thanks by clicking the Kudos Star in my post. If my post resolves your problem, please mark it as Accepted Solution so others can benefit too.

Designjet T520 will only print one page.

Hi, Brand new Windows 8 HP PC printing to a Designjet T520, will only print one page.I have met this problem on laserjets in the past and resolved it by enabling/disabling mopier mode.However none of the drivers I have tried (many) for the Designjet T520 have the option to turn on or off Mopier Mode. After many hours spent troubleshooting, I formatted and installed the Windows 8 machine again from scratch.Even with this brand new install on a bran new PC, I still cannot print multiple copies to the designjet. In the same office, 3 other Windows 8 machines are printing fine to the same plotter and can print mutliple copies. The driver versions are the same on all machines. Hope someone can help.Thanks.

This forum is focused on consumer level products. For the Designjet you may have better results posting in the HP DesignJet forum here, that is where the DesignJet experts can be found.

My hp 100 mobile printer will only print one page then quits. will not print all of the pages.

my hp 100 mobile printer will only print one page then quits. will not print all of the pages. i have rebooted, new install, and reset. still the same thing. when i look it shows that it is printing but there is nothing happing. i use this with my lap top.

Hello colt1,
Are you using Bluetooth or USB cable to connect to the printer? Did you install from the disc, or from the online program? When it sits there and doesn't print, does it eventually give error messages, lights flashing, etc.?
Thanks,
↙-----------How do I give Kudos?| How do I mark a post as Solved? ----------------↓

My ipod nano 6 will only play one or two songs then I have to force the next song to play. It will start several songs before settling on one. This just started and I havent changed anything. How to I make it go back to playing songs continuously?

My ipod nano 6 will only play one or two songs then I have to force the next song to play. It will then start several songs before settling on one. This just started and I havent changed anything. How to I make it go back to playing songs continuously?

Then back it up and do a restore. If that does not work and if you are still under warranty, call Apple tech support or take the iPod to your local Apple Store or an AASP.
iPod Tutorials
iPod Manuals
iTunes & iPod Hints & Tips

Will only print one page.

When i go to a multi page site ,the printer will only print one page .

Hi @elkman_5883,
Welcome to the HP Forums!
I noticed that your printer will only print one page, and I am happy to help you with this issue!
For further assistance, I require some additional information:
The Product/Model Number of your printer. Follow instructions in this link. Finding Your HP Product Model Number.
If you are using a Windows or Mac Operating System, and the version number. To find the exact version, visit this link. Whatsmyos.
If the printer is connected, Wireless, Ethernet, or USB.
If the printer is able to make copies.
If the power cable is plugged into a surge protector, or directly to the wall outlet. Issues when Connected to an Uninterruptible Power Supply/Power Strip/Surge Protector. This applies to Inkjet printers as well.
Please see this post, Want Good Answers? Ask Good Questions, by @Bob_Headrick, so you can get the most out of these forums.
If you are using Windows, I recommend trying our HP Print and Scan Doctor, and please let me know what happens!
Hope to hear from you soon!
RnRMusicMan
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!

Get 8004 error when using copy past command transferring pictures from one USB drive to another, why ?

Why do I get 8004 error, when I use copy past command to transfer pictures from one USB drive to another ?
There is no problem if the second drive is empty.

mumbles27 wrote:
one is MS-DOS
would that be in FAT32 or NTFS ?
mac OS extended (case sensitive)
i'm not 100 % sure but i have a fancy such a combination may not play well together.
nothing bigger than 2GB for one file
i was asking because FAT3 has a limitation in that it will not allow you to copy files larger than 4 GB.
JGG

2 X-Fi Surround 5.1 connected to one laptop, audio console only supports one?

M2 X-Fi Surround 5. connected to one laptop, audio console only supports one? Hi,
for multi room audio purposes I connected two USB X-Fi Surround 5. to a laptop. Windows detects the two sound cards correctly and via Winamp I can have both of them play simultaniously different music, which is great.
However, I can't seem to be able to make a selection between the two sound cards in Creative's audio console. I can only select one card, and of course, the sound settings only apply to that one card. How can I access the other card for sound settings such as 3D and crystalizer ?
The sound card selection menu allows me to choose between :
- Windows Standard audio
- SB X-Fi surround 5.
- X-Fi surround 5. Line / Mic in
- X-Fi surround 5. What U hear
I tried reinstalling the sound drivers as suggested elsewhere, but that doesn't seem to help.
Many thanks in advance !
Kind regards,
Cooled Spirit.

QRe: 2 X-Fi Surround 5. connected to one laptop, audio console only supports one?B Thanks, but that doesn't help, as soon as I unplug, the settings are "lost". It's the software that stores the settings, not the hardware.
My theory so far is, that this caused by?two identical?products : both have exactly the same?device name in Windows. I can imagine that when certain software tries to retrieve a list of available Creative?hardware, it might get confused when two identical names occur in the list, perhaps skipping one of the "duplicates". Windows device name is?provided either by the drivers or the hardware itself.
Of course, this is just a theory. Windows itself and software like Winamp seem to be able to handle this perfectly.
If I would have the technical know-how, I would try to rename the device name in Windows registry. Alas, the name appears at many places, I don't know which exact place to change the name, in order to obtain different device names. And that's assuming Creative software uses this...
Kind regards,
Cooled.

IPhone 5. Prior to the iPhone 5, I could listen to podcasts one after the other without doing anything. Now it will only play one podcast at a time, then I have to click on the next one. Not a great feature when driving. TIA, Sarah

iPhone 5. Prior to the iPhone 5, I could listen to podcasts one after the other without doing anything. Now it will only play one podcast at a time, then I have to click on the next one. Not a great feature when driving. TIA, Sarah

How do I get it to just play through all the podcasts that I've downloaded just like my 1st gen?
Group and order your podcasts to a playlist. Then play them from the playlist.

Will only support one USB drive at a time

Similar Messages

Maybe you are looking for