HELP: Time Machine super weirdness, ext drives just disappear...

Hi all and Merry Christmas!
I bought 2 brand new Maxtor One Touch 1TB Ext FW800 drives, intended one for Time Machine and the other possibly for backing up purposes or SuperDuper (http://www.maxtorsolutions.com/en/catalog/OTIII_Turbo/index.html)
*Both drives have the same result:*
I mounted the drive each for the first time, and use Disk Utility to erase (format) again, simple format, no raid no nothing.
Then I set up Time Machine to do the 1st initial back up, but after a while, into a few GB of data back up, the ext drive *just suddenly unmount and disappear from the Desktop*. Twice for both drives. Now when I *turn the drives back on, I can't get them to mount... HELP!!*
Did I miss something, did something wrong or I should have format it as a RAID drive as it should be?
*But right now I need to "rescue" the drives back, how do I do it?* OR that the drives are DOA and somehow faulty?
Thanks again and Happy Holidays, hope someone is reading this... cheers!

Hi. I did a Erase like any other internal or external Mac disk - Journaled, not FAT, etc. One simple partition, no GUID etc.
Anyway, I am very happy to report that the Time Machine drive is now working fine, here was what I did before that failed:
1. The 2 1TB Ext FW800 drives were connected to a Belkin FW800 Hub, the hub is then connected to the sole FW800 port behind the iMac
2. I gave the designated Time Machine drive a custom icon, using Get Info/Copy & Paste the icon graphic.
So I remove the hub, connected the 1st drive to the FW800 port, and the 2nd one daisy chain to the first drive. This actually remounted the 2 drives and I re-format and re-erase them again.
This time my designated Time Machine drive I left it alone as it is, no icon pasting whatsoever.
Did the initial backup, the FW disk icon immediately changed to the Green Time Machine icon drive, the process took quite a while but has completed and successful.
So I am not sure whether it's the combination of the above points 1 & 2, maybe the hub was faulty (it's new), or because I change the icon. Anyway, something learnt.
Cheers

Similar Messages

Time Machine ejects my Ext Drive

Hi,
I hooked up an external (1.5TB) drive to my MacBook and ran time machine. It said backing up 103GB. Everything went fine until about 14GB and somehow ejected my ext drive. The drive disappeared. I unhooked and put the drive back. Ran TM again. This time it was backing up about 1KB a minute or so. And soon spit my drive again - showing a failure to back up.
I am not willing to reformat my ext drive because I have put a lot of video files on it.
Any suggestions?
Thanks

Wobbles wrote:
Hi,
I hooked up an external (1.5TB) drive to my MacBook and ran time machine. It said backing up 103GB. Everything went fine until about 14GB and somehow ejected my ext drive. The drive disappeared. I unhooked and put the drive back. Ran TM again. This time it was backing up about 1KB a minute or so. And soon spit my drive again - showing a failure to back up.
I am not willing to reformat my ext drive because I have put a lot of video files on it.
That may be a problem. How is this drive formatted? Was it previously used on Windoze?
The most common cause of an initial Time Machine failure is the drive not being set up properly. Check it via the instructions in item #C1 in the Time Machine - Troubleshooting post at the top of this forum.
As mentioned there, if the formatting is correct, see item #C2 for other possibilities.
There is another consideration here; since you already have other data on that disk, you really should partition it, so TM has it's own, exclusive space. Otherwise you're likely to have conflicts later on. See item #3 in the Frequently Asked Questions post at the top of this forum.

My iphoto library disappeared. i am trying to restore my library from time machine -- from an external drive -- but everytime it tries to copy my library it tells me it can't do it because i don't have access to my iphoto library??!!! help!!

My iphoto library inexplicably disappeared! i am panicked but i do back up by time machine to an external drive and also to JustCloud. I am trying to restore my iphoto library from a back up on feb 28, 2014 and it says it's copying but then gives me a message that it can't do it because i "don't have authorization to access iphoto library"?! what does this mean? i really want to get my library back on my mac. Also if anyone knows why this happened or where my photos might be on my computer, i'd appreciate help with that, too.

Thank you Terence for your help. I was able to restore my backup from my time machine ext drive to a new 1tb seagate ext drive. so i felt sort of ok. but yesterday that older ext drive i used for time machine wouldn't open! i called applecare and they trouble shooted with me and said it's probably a goner and data is probably corrupted. it's only a few years old and i'm very careful with it. my husband accidentally dropped my new drive last night -- i know, unbelievable, i was SO upset, poor guy -- but I'm so stressed with all of this. i have 10 years of photos and videos. so now i only have the one newer drive with a backup. i have to buy another one today to backup again so i at least have two backups. i tried to delete a ton of files last night to free up the 30 gb of space i need to get my full library back on my mac. i have 90gb free and deleted 7 years worth of photos i had on picasa that were in my "pictures" folder and also a ton or random photos and videos i had in that same pictures folder and thought that would give me the 30 gb but it hardly freed up any space at all! do you know why that is? all of this stuff is really a pain and really stressful. thank god i did have a backup in the first place but now i am panicked the one i have left will somehow crash. especially after my husband dropped the drive lastnight! it didn't fall far and fell onto a wood floor and seems fine, but after my older ext drive crashed yesterday -- and i lost my entire iphoto library a fewweeks ago off my mac -- i feel cursed. any answers you have would be great. thank you.

Help w/ Time Machine and 2 External Drives + Main Drive

I need some help on the best possible setup with the tools on hand...
Currently I have the following:
iMac with 500GB Hardrive
My Book with 2 TB Hardrive
My Book with 1.5 TB Hardrive
What I want to do (in my head anyways) is have my main drive for my normal applications (ilife, iworks and everything else under the sun) and use the 1.5 TB for my iTunes as i have alot of movies and music and then use my 2 TB to back up the main drive and 1.5TB drive that way if my 1.5TB drive dies my iTunes are still in tack and likewise for my main drive with my applications.
before I go ahead and do this... is it best just to use time machine on my 2TB drive? or should I parition it say 1.5TB for Time machine and 500 GB for Carbon copy so I can boot off of that drive if need be?
I have done some research on the subject but just want to make sure I'm not missing a step or if there is a better set up I should do with my current gear (500MB main drive, external 1.5 TB and 2TB drives)
thanks!

Narayan9 wrote:
total data that needs to be backed up isnt that much... probably around 600-700 MB currently
I'm sure you mean 600-700GB
(but it is growing). I'm in the mitts of ripping my purchased DVD's to itunes so I can watch them VIA Apple TV.
The whole reason for me buying the 2 external drives was to ensure my itunes files wouldnt be lost in a hardrive failure as I have a very large DVD collect (around 300) and as you know its very time consuming to copy them to itunes in the first place and if my main drives dies Im not sure if I would have the patients to re-copy everything to my iMac.
you can use the 2TB drive to back up everything you have now via TM. but if it grows much more then I would suggest using a different backup solution as outlined in my first post. TM needs space for incremental backups and some overhead just to operate. most other backup tools don't.

Time machine super slow on Mac Pro, had to turn of Spotlight

I ran time machine on a external drive and had no problems for years. I swithed to a larger internal hardrive and the problems began. I read about turning off Spotlight and I did and everything worked fast. But do I need to turn it off with every back up? I'm on lion, did mountain lion fix the issue?

It would probably take 12 hrs to zero (long full format, zero all) a 2TB drive, and especially any that are green, that don't have 7.2k spindle speed.
The USB interface and some external cases when used with TimeMachine "drop off" and stop communicating and act as if they are no longer present. So interface like USB plus variable rpm and the fact that green drives will park the head and 'sleep' regularly, causes trouble.
Disk Utility : Help menu. Tells you how to use Erase or Secure Erase.
Use to be there was format or initialize. Now it is all just erase and erase options.
And even then zero all does not always find or map out a weak sector.
Internal would be native SATA interface and avoid the 'other' interface and the external drive bridge (has to have a bridge to talk to SATA over USB or FW interfaces).

Time Machine backing up a drive which is no longer connected

I have recently removed (and replaced) one of my external drives. I have Time Machine running on third drive. When I look at my recent backups, Time Machine is still creating a folder (and contents) for the drive that no longer exists. The only difference being, it is putting " 1" after the drive name. What is going on?

*Bump*
I'm going to be switching my Timemachine drive shortly, and I'm considering not transfering my backs, just to get around this bug. Obviously that's not ideal, so if anyone can shed light on this it would be great.

Time Machine encryption - after restart, drive won't mount

Hi all.
I enabled Time Machine on my Drobo drive, enabling encryption. All was good, Time Machine started encrypting away.
I restarted my Mac, and now my Drobo won't mount.
In Disk Utility, it looks like this:
I'm unable to verify, repair or mount the disk.
I wasn't prompted for the Time Machine encryption key, I assume that this is stored in my Keychain and unlocked on the fly?
But regardless - I'm unsure of what to do next! I've got quite a bit of data on the drobo, and didn't expect it to render the drive completley useless. I'll be gutted if I lose my files on my Drobo besides the Time Machine backup I had.
Any help, suggestions, advice would be much appreciated.
Update: Output from Disk Utility when trying to verify the drive:
Verifying partition map for “Drobo”
Checking prerequisites
Checking the partition list
Checking for an EFI system partition
Checking the EFI system partition’s size
Checking the EFI system partition’s file system
Checking all HFS data partition loader spaces
Checking Core Storage Physical Volume partitions
Checking storage system
Checking volume.
disk1s2: Scan for Volume Headers
Invalid Volume Header @ 8795614850560: unsupported format
disk1s2: Scan for Disk Labels
Invalid Disk Label @ 8795598069760: cksum mismatch
Invalid Disk Label @ 8795602264064: cksum mismatch
Invalid Disk Label @ 8795606458368: cksum mismatch
Invalid Disk Label @ 8795610652672: cksum mismatch
/dev/disk1s2 is not a CoreStorage volume
Problems were found with the partition map which might prevent booting
Error: Storage system verify or repair failed.

Here is the output of `diskutil coreStorage list`:
>: diskutil coreStorage list
CoreStorage logical volume groups (1 found)
|
+-- Logical Volume Group 493EC175-1234-465E-B6F5-324615AD2B94
    =========================================================
    Name:         -none-
    Sequence:     0
    Free Space:   0 B (0 B)
    |
    +-< Physical Volume 92E1ADAF-4567-40C6-BA94-4DB39023E3F3
        Index:    0
        Disk:     disk1s2
        Status:   Failed
        Size:     -none-
Not looking good? But I badly need to recover the data on this drive. How can I ever trust Time Machine to backup my files in the future if it corrupts things like this?

Can I use Time Machine as a backup drive for my Vista 32 PC?

I cannot see any of my Mac computers or Time Machine on my network through my Vista PC, even though I have a wireless card in the PC which can connect wirelessly. I have my PC sitting next to my Time Machine that is the hub for my network. I am connected to the internet via ethernet connection daisy chained through my Time Machine which is connected to my cable router.
I cannot figure out why my PC cannot "see" my Imac, emac, Time Machine, and macbook that are all connected to my wireless network. The PC and Time machine are the only devices with an ethernet wired connection.
I would like to use the Time Machine's 1 terabyte drive to back-up my Vista PC.

I would first set up my mac and vista to do simple file sharing and then work my way from there. If you are unable to figure out simple fire sharing i would go look on other forums or advice. Its rather simple to do but it can also cause a lot of headaches. I have wanted to connect my mac and windows server to my network for a while and just recently figured it out.

Using Mac Mini, Time Machine and External Hard Drives as a Backup Server

Hello...
I own a graphic design studio and have been looking for a long time to create/buy a no-thinker backup system for my macs. I have 4 workstations that I would like to backup to one central "server".
So what I was thinking was buying a Mac Mini, 3-4 external USB 2.0 Hard drives, external Blu-Ray burner and upgrade all our systems to OS 10.5. What I need to know is, will each work station with Time Machine on it back up across the network to a specific drive on the Mac Mini? If I have each workstation automatically mount one external across the network onto the desktop, will Time Machine recognize that hard drive as a legitimate drive to backup to?
Having the external Blu-Ray disc burner will give me the ability to burn data to a disc so I will have a way to take some of my information off-site. Since we are a graphic design studio, we use large amounts of disc space and regular DVD-R (4.6 gigs) is just not enough to back up some projects.
Can someone enlighten me, and tell me if this would work or not. It's the only way I can see me creating something that has enough space, will back up automatically across the network and allow me to make off-site copies of my data without spending $5,000.00.
Thanks for any comments you might have on this topic.
-SoupGFX

I'm a member of a freelance graphic artist team and have been scraping by with my MacMini and CS3. I recently obtained a used iMac (approx. 2 years old) and, instead of painstakingly transferring everything left on the Mini to the iMac, I wanted to know if it's possible to turn the MacMini into a pseudo external hard drive using the FW800 port.
I already had an external attached to the Mini and plan on using that as well, but I tend to hoarde information and run out of space really quickly. So keeping the mini around, preferably in a way that I can access it as an external through my iMac, would be perfect. I have very little experience with networking and don't have a wireless connection (yay modem cables!) so I don't quite know how to figure this out.
Has anyone done this? Would a FireWire 800 work? Would I need to set up a network between the two and use them as independently connected computers?

Time Machine with multiple hard drives

I use a very large external hard drive for time machine. I back up to this time machine, the two hard drivs that are inside my macbook pro, 512GB ssd, and 250GB SSD that is in the optical drive. I then backup a 1TB portable hard drive which holds all my movies and then I backup another 1Tb portable hard drive which holds all my "reserve" files, which means they are files that are no longer important to be on my computer. Old pictures, music, etc.
Now, I can't plug all of these drive's in at once. So, let's say I have to do a backup and I have nothing plugged in but the time machine external hard drive. Will it only backup the two hard drives that are in my computer and then later somehow let me go and restore the other drives? Or will it attempt to restore all 4 drives at one time? Because if the one in my computer mess's up, the other's may not be messed up and I do not want it to restore those.
I have used Time Machine before to restore my system. But never since I have started adding extra drives for Time Machine to backup.
I am also planning on adding, yet another drive for it to backup which is a 1TB portable hard drive that I keep raw files on for photography. I'm just curious how this works when and if the time comes.

well superduper is FREE, CCC isnt.........CCC can do the daily updates etc,. Superduper DOES NOT. the CCC and Superduper CLONES are bootable.......so, if your HD crashes, you can throw in the CLONE, and youre back and running in mins, rather than hours etc .
You should NEVER consider a backup a "backup", ........2 copies is 1, and 1 is none.....always have 2 copies of important files / pics etc etc,......... DECADES of work have been lost by people who thought their stuff was safe because they had a (meaning 1) backup.
Simplicity? Yes, Simplicity is my religion. CLONE your HD with programs and settings, ......and use a 2nd HD updated daily / weekly etc (preferable 2 such 'seecond' harddrives, copies of each other) with all personal stuff / work / pics / vids/ documents.....
superficially time machine is simpler, "smack a button and everything backs up".......in REALITY however when it "all goes up in flames"................the pro method (and my method) is QUICKER and more reliable by far to get down and running.
Ive restored other peoples from total crash and burns via Time machine.......and "my" way............my way always ends up faster by a mile. Also personal / work etc files are kept autonomous to the system data / programs OS,.....as it logically should be.
Time machine is the fastest incremental backup........but its as slow as paint peeling if you need it in case of a TOTAL CRASH.......wherein a bootable clone can be thrown in , in less than 20 mins.

Time Machine and a network drive combined

I figured out how to connect Time Machine with a network drive (like LaCie Mini). It works great, the only thing is, everytime I restart the mac I need to re-connect manually to the server in order TM can run.
I wondered why OS X gives not the option to connect to certain servers AUTOMATICALLY when starting up?
thanks for help

Well,
PLEASE can you tell us how you figured out how to backup to a network drive because Apple tech told me you could not do that!
To your question though, on those LaCie drives, you have to log in with a password, right? On the drives I have used with clients, although the password was filled in for me, we had to press OK every single time to actually connect to the drive... I could not bypass the login procedure on the drive, it had nothing to do with OSX. You might serve yourself well to see if LaCie can offer you a way to connect to the drive automatically?
Although I know nothing about scripts, could you just get a script to run automatically at startup to connect you to that drive?
I'm interested in this topic so please feel free to share what you know and your experience with it. Thanks in advance.
I was also frustrated to find out that I couldn't even back up via Time Machine to a drive connected via USB to my Airport Extreme... I mean come on!

How to use Time Machine with an external drive?

Hi…I’m new to this, I hope someone can help me=)
I’m trying to back up my Macbook Pro 10.6.8 using Time Machine with an external drive Seagate Backplus Slim. I’ve tried several solutions that I’ve found through different forums but still wouldn’t work.
Every time I opened Time Machine, it has this appearance:
Then when I click “Select backup Disk”, it goes on like this:
And after I click “Set Up Time Capsule”, it has this:
It keeps saying that it couldn’t find AirPort wireless, even though I have good WIFI connection.
Anyone know what I should do? Please help….Thanks everyone

Ayuphie ~ In your Time Machine Preferences panel, slide the OFF-ON switch to the ON position:

Replaced hard drive, but can't access Time Machine backups of old drive

My internal hard drive was failing so I replaced it. I told the people that replaced it that I could install the System myself and that I had backups of my data.
So, I got the machine home, booted up from the Snow Leopard Install DVD and selected Restore from Time Machine. I chose the last backup which was Mountain Lion 10.8.2. It crashed after several minutes.
So, I restarted. But I had my finger on the Control key rather than the Option key, so it booted to on-line recovery mode. When it asked me if I wanted to restore Lion I decided, "Sure. Why not? Since the restore from Time Machine doesn't work." That took about six hours.
Then I went to the App store and downloaded Mountain Lion. Another six hours and that is done.
Now I can't access the backups on Time Machine. They appear to be there. It shows backups to Feb 2011, which is when I installed Time Machine on an external drive. But I can only access databacked up from my new drive and Admin account.
Last night Browse Other Drives for Time Machine at least showed the old backups. After shutting down overnight only the new backups show.
I've run verify and repair on the external and it's okay.
Please tell me I can get that data back. There's over a decade of stuff there going back two other Macs. Photos, important documents, all my writing are there. I really need it back and I can't understand why I can't get back.
Thanks in advance.

Hi all... I had a very similar issue. I had a hard drive replaced by Apple on my iMac due to a total hard drive failure. I attempted to restore my last time machine back up through my time capsule but I get some type of sparse bundle package error. It appears that something is coming back from the back up as I only have about 180GB remaining space out of 1TB. Any advice? It appears that Apple had re-installed the latest version of Lion back to my hard drive. I'm completely distraught here as like Romantic Heretic, I have over a decade of information currently lost.
Any help with step by step directions would be GREATLY appreciated.
Thanks

Is a WD My Book Studio Desktop 3TB Hard Drive - FW 400/800, USB 2.0, Apple Time Machine Ready external hard drive bootable with my Powerbook G4 12" PPC 10.5.8?

Sirs or madams,
Is my Powerbook G4 12” PPC 10.5.8 'bootable' with a Western Digital My Book Studio Desktop 3TB Hard Drive - FW 400/800, USB 2.0, Apple Time Machine Ready external hard drive? Western Digital says officially no, but that it MIGHT be. I primarily live in China and bought a datastorage.com.cn Clearlight s400+ external hard drive enclosure with a 320GB disk drive a few years ago in China. My computer 'boots' fine from it, but since I got it in China all the paperwork, etc. is in Chinese; my Chinese isn't quite sufficient enough yet to read it. But there are references to something called "SATA", whatever that is.
My level of computer 'under the hood' knowledge is extremely low. I've been told that SATA has some relationship as to whether or not an external hard drive will boot a computer via the Firewire connection, something relating to 'interface', which I assume is how separate electronic gadgets work, or don't work, with each other.
I frankly don't care much for computers, the internet, or their related gadgets such as all these fancy phones. I longingly reminisce about the days when there were no such things. I use a computer & the internet because I have to, and unfortunately unlike a car where one doesn't have to have 'under the hood' knowledge to operate it, just knowledge of the steering wheel, brake, gas, etc., one seemingly must know a ridiculously great amount of 'under the hood' knowledge, including jargon, to operate computers.
So, please try to respond accordingly; thank you.
If this particular external hard drive won't, for certain, be bootable with my computer, can you advise as to what readily available brand/model would be in the 3TB range for a similar price, roughly $150ish??
Thank you very much.

Mr. BGreg,
Thank you very much. "...under the covers...". I think you meant "under the hood", as in a car. I suppose "under the covers" would be man/woman interfacing, which I am familiar with!
Actually, I'm back in the US now for a few months. I looked at the OWC web site, but only cusorily so far. I'll contact them; they appear knowledgeable about Apple computers.
As to what you wrote about Western Digital's cases, I certainly wouldn't want a poor case. In China I had over time gotten 3 different external drive cases, 3 different Chinese brands, and separately bought Hitachi brand disk drives that 'simply' plugged into the cases. The drives are roughly 80GB 120GB and 320GB. The two larger ones are in cases that have Firewire plugs/jacks, which are bootable with my computer.
So my understanding, as you wrote, has been that my Powerbook will boot from an external hard drive, provided it connects via Firewire, and the disk drive itself is 'normally' formatted with however my computer's own disk drive is formatted, (HFS OS extended (journaled) or some such??). So I was left wondering why Western Digital would indicate that even though their such-and-so external hard drive case/drive was Firewire capable, that they would then say it would not be bootable with my Apple PPC computer......
Well, anyway, since you indicated Western Digital's case quality is suspect, then I'll try OWC and disregard Western Digital.
Naturally, OWC should be able to address this, but your thoughts are also welcome. You mentioned the OWC cases are good with Apples. Would the disk drives OWC supplied with the cases also be of relatively dependable quality?? From my so far only cursory look at their web site they appear to have various options, including case only options where I could insert my own or their own drives. These sorts of options seem preferable, also along with quality components.
My Powerbook has been in use since 2004. In China I put in a 1.25 memory 'chip' in the bottom and installed the 10.5.8 operating system, which I understand are the maximum workable with my Powerbook. When I inquired with Chinese friends if my 1.33 GHz processor could be taken out and a more powerful one put in, they said it wasn't feasible because in my particular computer my processor was, as I recall them saying, soldered/'permanently' connected with the 'motherboard', that it would just be easier to get a new computer.
I would be with them and they would nonchalantly open it completely up showing me all its tightly arranged 'innards' while at least giving it a good internal dust/dirt clean job for cheap lunch and a beer (& so much dirt/dust/lint there was!)...these are the same folks who build the things of course...fast moving hands with tiny screws flying everywhere, but everything 100% all back in place when finished.
My Chinese friends also said that nowadays Apples are not as well built as when my Powerbook was built, that nowadays an Apple's life expectancy was considerably lower, so I fear that when I get a new computer that, though it will be more up-to-date and powerful, etc., it most probably won't last near as long as my Powerbook has. They also said that in an older computer the fan was often the first component to go bad, and if a new one couldn't be easily found, as they said was my case, then you're just left with having to get an entirely new computer. Part of why I dislike electronic computer gadgets generally is that they are obsolete so quickly.
So, anyway, thanks very much for your information.

How do I convert a Time Capsule former Time Machine into an external drive?

I want to convert my 2TB Time Capsule (which I formerly used as a Time Machine) into an external drive. I now have a 3TB which I have set up as the Time Machine thus freeing the 2TB to hopefully work as an external drive. The 2TB now sits with the old Time Machine backup data intact but I no longer need that backup. I had it hooked up to my modem but not have hooked the ethernet up to my desktop (is that right?). Please advise how to prep the 2TB Time Capsule to be a normal external drive.

1) How do I turn the wireless on the TC on or off? Where do I go to change the settings.
Spend some time in the airport utility.. the easiest way is simply go through every screen until you are familiar with the controls.
Open airport utility.. click the TC.. click edit.
Click the wireless tab. Click on Network mode.. select Off..
2) I found the Touro 4TB and the price is quite inexpensive compared to other 3 and 4TB units. What's the reason for that? Am I missing something in the specs? They offer a Touro Deskpro and a Touro DX3. I can't tell from the description what the difference is - I can't see beyond 4TB. Is one preferable over the other?
They are competing with better known brands.. ask anybody hard disk brands they know.. and either Western Digital or Seagate come to mind. People easily forget there was hitachi (ex IBM). Although Hitachi sold their disk division but due to anti-trust laws it could not be sold entirely to WD who bought half of it.. Toshiba bought the other half. WD tries to hide the Hitachi drive name to bury it.. they bought to bury. But Toshiba keeps it alive.
I actually buy Hitachi drives (Toshiba now) in preference to the others. But everyone has their favourite. The Touro are just good value for money.. the case is not exactly the work of art.. buy LaCie for that. It is a bit over large and the plastic is plasticiky, if you get my drift. Silver plated plastic to make it look like metal is not my favourite.. but I am hardly concerned with the look..!! It looks like an external hide drive.. hide it if you find it ugly.
The difference between the Touro Pro and the Touro DX3 4TB drives is the speed of the drives, the pro is 7200rpm and the the DX3 should be 5400rpm.
I am not 100% sure of the above.. but it is likely to be different drives.. We have not seen DX3 in our market until recently.. they were all pro.
None with bigger than 4TB at this point..
3) OWC - never heard of this group - are the hard drives dependable in your experience?
Retailers who sell Touro and Toshiba and LaCie and every other brand.. sell online and to overseas.. good prices if not the cheapest.. have their own lines of shells, as well selling all the others.. have their own brand SSD but obviously bought in from elsewhere.. RAM, kits for all sorts of things.. huge catalog and very Apple orientated.
I am amazed if you have been on a Mac for more than 5min.. google ads have not flashed up OWC 20 times.. you must have good resistance to advertising.
Please google OWC.. if I post their actual URL the post will get deleted.
Look up say external drives.. they have one zillion of them.

HELP: Time Machine super weirdness, ext drives just disappear...

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