Problems booting from external drives

Ever since I got this 6-core 2013 MacPro (January 2015), I have had strange problems and glitches, but for this posting, I am talking about problems being able to boot up from external drives. I took the 4 external drives out of my old 2009 MacPro and put them into a 4-bay Thunderbolt enclosure. This enclosure can be configured as a RAID if all drives are the same (which they are not) or it can just be a place to be able to access all 4 drives. I used to be able to boot from each of those drives on the older MacPro but I am unable to do so now. They show up in the System Preferences/Startup Disk but if I choose one, it just reboots into the new MacPro drive. I even tried pulling out a couple of the drives and mounting each into a USB 3.0 (Sabrent) dock and still I could not boot from those drives which have the latest version of Yosemite. Yes, they are formatted correctly. I used to boot from them. I was able to clone one of the drives to a Seagate USB 3.0 hard drive and boot from that. Although, the clone was not perfect. It didn't transfer all my settings so I could recover some logins and serial numbers I wanted that I have never been able to retrieve since I got this new Mac.
Yesterday, I formatted a 32GB flash drive and tried to install Yosemite on it. I planned to put DiskWarrior on it. When I started to install Yosemite (from a saved download) it let me choose that drive, but when it restarted before installing, I was right back where I started on my MacPro's hard drive.
Is this normal behavior for the 2013 MacPro? Or is it just mine? I am beginning to think I may have a lemon since I have had other strange problems that don't go away.

Not all external devices are bootable. First stop would be involve whoever handles the 4-bay Thunderbolt. Seeing how it has a bridge most likely in order to support RAID mode that may not have the correct frmware or other reasons.
https://bombich.com/kb/ccc4
https://bombich.com/kb/ccc4/search/bootable%20volume
CCC is the only program I would be using.

Similar Messages

Problem booting from external drive

I'm having trouble booting my MacBook from an external USB drive.
I've created a bootable backup of my hard drive, using SuperDuper! (in order to be able to install a bigger hard drive and restore my current drive state). If, with the drive attached, I restart and hold down Alt (which I understand should offer a choice of drives from which to boot), I get nothing but grey screen (ie. the first grey you see before the apple logo comes up right at the start of startup). I have been able to boot from the external drive by changing Startup Disk settings, so I'm sure there's no problem with the external disk volume.
The drive is an Iomega 80GB USB 2.0 drive, and I'm running 10.4.10 on a 2GHz Core Duo MacBook.

Hey guys,
Thanks for the feedback... here's my update (still no joy):
• I'm not sure about the GUID table - how do I check? Does the fact that I can boot from the drive having selected it in my System Preferences mean that it is? It is definitely HFS+ formatted, however. (I gave bad information about the drive type, however - it's a Freecom 400GB, not Iomega 80GB, not that I suppose that makes a difference.)
• After holding that Alt key for a very long time, my MacBook did show me something other than a plain grey screen: a single, large, internal HD icon in the middle of the screen, above a vertical arrow icon. I take this to mean that the MacBook is recognising the internal HDD and no other volume. The external drive was still plugged into the USB port.
• The external drive is in fact partitioned as two volumes.

Problems Booting from External Drive

I have a 2009 era Mac Mini (refurb) 2GHZ, 2GB RAM and 320GB internal hard drive and running Snow Leopard. I have been using a 1TB NewerTech miniStack V3 drive to boot from.
Last night the computer froze up while watching a show on Hulu.com. Nothing would respond so I had to shut it down with the power buttons. Now, when I boot from the NewerTech drive it boots but shows a blue background, the hard drive icons (Mac HD, NewerTech and Boot Camp) and the menu strip at the top. No dock, spotlight won't look up anything and trying to shut down through the Apple icon in the top left corner causes the whole screen to go solid blue, spinning beachball and then back but nothing opens or drops down to show choices. I can look in the hard drive icons but all the files show "0 bytes" and nothing can be done.
I can boot fine from the internal Mini drive and everything shows up that should. I can and have run various Disk Utility stuff on all the drives from there. No change when booting from the external:-(
I WAS able to boot from the external in Safe Mode which shows me that my files (over 300GB in iTunes alone!!) and applications are really still there!
I now have Drive Genius 3 at work along with the new NewerTech MiniStack I bought to do a clone backup (ironic isn't it?). No, I don't have a time machine backup either. I couldn't afford another drive until recently.
What has happened? It's like something has gone missing but I don't know what.
Thanks, AndyB, NH.

Well, I was afraid I'd have to do something like that. But I started it in Safe Mode (hold Shift down when restarting) and everything showed up like it should have (with whatever gets disabled by safe Mode). I ran repair permissions which I am sure did nothing else. When I got back this morning I restarted normally and everything was there. So I guess that fixed it.
I was really freaking and now have the other 1TB drive as a clone copy just in case something happens again.
Thanks, AndyB, NH.

Trouble Booting from External Drives - MBA 2012

Hello,
I have a brand new 13" MBA which I'm working on building an image to use for deployment using Carbon Copy Cloner 3.4.5. For whatever reason, I can't boot the new 2012 MBA from an external LaCie FW800 or Thunderbolt 1TB Little Big Disk that is running either 10.7.2 or 10.7.4. As soon as I select the drive to boot from when holding the Options key or from selecting the partition from Startup Disk in System Preferences, I get the do not enter icon(circle with the diagonal slash). I tried both plugged in through a Cinema Display and plugging the Thunderbolt drive directly to the laptop. I confirmed both LaCie drives boot properly on an iMac and the last gen MBP/MBA.
Laptop Specs:
13"
1.8GHz Dual-core i5
8GB
128 SSD
10.7.4
Curious if anyone has run into any problems booting from external drives on the new 2012 MBA.
Thanks,
Paolo

Please be sure you have prepped these external drives correctly:
Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Security button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
My suggestion for cloning is to use Disk Utility. This will also automatically clone the Recovery HD, as well:
Clone Lion using Restore Option of Disk Utility
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Select Disk Utility from the main menu then press the Continue button.
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive.

Problem booting from external DVD drive on Lenovo S10e

Hi,
I recently purchased a new Lenovo S10e ideapad, a few weeks prior to that I purchased an external DVD rewriter drive manufactured by LG, the drive works perfectly on every computer I try with the exception of the Lenovo ideapad S10e.
The thing is that the drive is being recognized and installed by the Windows XP Home Edition the S10e came with but when I try to boot a bootable CD using then drive on the S10e ideapad I almost alwasy fail to do so.
I set the S10e BIOS to have the USB CDROM as first boot device, in addition I used the F12 key to use the boot menu to choose the boot device, in 9 out 0f 10 atempts my external drive will not show in the boot menu and when choosing the enter setup option I see that the BIOS do not list it as the USB CDROM, instead it says "USB CDROM:" rather than have the drive name after it.
In the 1 time out of 10 it does work the BIOS seem to be identifying the drive and it shows in the boot menu, however I cannot work with it for a more than 1 minute without it stopped being recognized again.
The problem seems very strange to me as the drive works under the windows operating system and do not have any problem whatsoever on other computers, I have tested the external drive on my PC, another Mini Laptop from LG and a GIGABYTE Laptop (Normal one), all of which had no problems recognizing the external drive and booting from it.
I will really appreciate if I can get some help with the problem.
Thanks.

I've had a similar issue with X61 and the external DVD drive from Lenovo.
In my case, it was the power issue. On the back of the drive, there is a small table says that the drive needs a 3.0A 5V power input. One USB 2.0 port can only provide 0.5A. I don't know if the drive has any special, low power mode, but I suspect that even if it has, 0.5A is still not enough to fully power it. I've checked the current with the multimeter, and at peak times, the drive draws 550mA. Even then, it makes a stuttering sound for a few seconds, before finally spinning the DVD disk. I've also noticed that the DVD works most of the times when it's connected to the left USB port. That may be because of how the laptop's internal power circuicity is laid out (+separate USB host controller for each 'side' of the laptop). Another thing that seems to help is to disable all 5V driven devices that the laptop uses: the wifi card, bluetooth, any additional devices connected to the USB bus / to the ethernet port / SD card port (I'm not actually sure which of the devices are 5V and which are 3.3V, but the best option is to disable all of them), maybe even remove the battery (if it's charging). Finally, the DVD drive works better if the laptop was turned on and runnig for some time, rather than it being turned on "a minute before". Also, in the BIOS, there is a setting that changes the speed of the DVD drive, but switching it to "low" didn't seem to affect the external drive (at least not before Windows boots up).

External Drive with Time Machine, booting from external drive with utilitie

I'm using Time Machine now with
a LaCie 1TB external hard drive.
Everything works fine.
But, I've been wondering:
Can I place a program like TechTool
on the external drive (that Time Machine uses)
and boot from that external drive.
I would like to be able to do that,
because diagnostics and repair programs
only works properly and fully when they run from
external drives. Anything on the internal drive can be repaired
and examine. Impossible to do if Techtool is on the same
drive that's been examined.
Any thoughts as to what I should do?
Thanks
iMac, Leopard, Time Machine, Lacie Quadra 1TB drive.
P.S. Stupid question: If my computer crashes, and I reboot from Time Machine
(from the external drive) how does the computer know which backup to take ?!?
Isn't there many versions of the OS on the Time Machine backup taken at different times?

pitou wrote:
P.S. Stupid question: If my computer crashes, and I reboot from Time Machine
(from the external drive) how does the computer know which backup to take ?!?
Isn't there many versions of the OS on the Time Machine backup taken at different times?
As V.K. says, you can't boot from TM backups.
But you can restore your entire system from any one of them, per the procedure in #14 of the Frequently Asked Questions *User Tip,* also at the top of this forum.
You can also selectively restore from them, while running normally. See #15 in the FAQ Tip.
You might want to review these:
Time Machine Tutorial
Time Machine 101
How to back up and restore your files
Time Machine Features
Apple - Support - Mac OSX v10.5 Leopard Time Machine
and perhaps browse the rest of the FAQ Tip.

MacPro can't boot from external drive

Running 10.7.3 and a MacPro which gets backed up each night with SuperDuper. Can't boot from this drive (black screen). Yet I can take the same drive and start up my Macbook Pro! So it isn't the drive or the data on it. I'm stumped. Could this be related to an issue where I can't get this same MacPro or system to successfully backup to Time Machine without error? The boot drive seems OK (ran Disk Warrior and Disk Utility).

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of this exercise is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login. Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode and log in to the account with the problem. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Test while in safe mode. Same problem(s)?
After testing, reboot as usual (i.e., not in safe mode.)

Problem erasing MacBook drive while booted from external drive

Hello,
I'm booted on a MacBook Pro from an external drive, and I want to erase the drive inside the MacBook using Disk Utility from the external. For some reason or another, it won't let me do this.
When I click on the Erase tab (whether clicked on the disk itself or the volume "Macintosh HD") and try to erase it, it returns with the error:
Disk Erase failed
Disk Erase failed with the error:
Could not unmount disk.
When I try to install an image onto the drive, I get a similar error, except it says "Operation not permitted."
When I tried it while booted with an OS X DVD, it worked fine.
As far as I know, I should be able to do this while booted from the external HD.
Any solutions to this problem?
Thanks,
Jason

Hello Jason and welcome to the discussions. You could try to re-partition the internal drive while booted from the external. Using disk utility from the externals Application/Utilities folder click on the internal drive (the manufacturers #, should be above the internal name) and select the partition tab.
change the partition table and then restore it back to the original. This will wipe out all the partitions and should show the drive as empty. Then I would erase all the free space using the erase tab and selecting your Macintosh HD or whatever you named your new internal startup drive the click on the "erase free space" button. Select "zero out deleted files" then erase. It will warn you that the drive is full when it gets near the end...thats okay just click to ignore or proceed. That should do it.
Cheers,
Glynn

Problems booting from external firewire drive

Here's a weird one...
I'm trying to help a buddy with a 3rd gen MBP and a new WD 'My Studio' firewire external drive.
He can mount and use the drive but is unable to boot from it. When starting up his machine with option, the drive doesn't show up as selection. The really odd part is the drive does work if plugged in with the USB cable!
The drive in question DOES work as expected on my 5th gen MBP with firewire. Further, I can stert my MBP in target disc mode and it will function as expected as a bootable external drive for his machine. The system in question was cloned with Carbon Copy Cloner. And again, it boots from my MBP.
I've tried different sets of cables (even though everything works on my system). I actually had him send the drive back for warranty replacement but of course the new one behaves the same way.
What could be the cause of apparently certain firewire drives not being bootable (but otherwise working) on a 3rd gen MBP? The intended workflow is to be studio/audio work so using the USB connection for a workaround would not be an option.
Any clues? Windows is not even installed on any of these machines!

baltwo wrote:
FWIW, many WD HDs won't boot Macs and booting Macs isn't supported. Details at their site. That's the main reason I never recommend their crappy HDs.
Actually I'm very familiar with that list- spent a lot of time looking at this past week!
Ironically, the majority of that page is a list of drives which they claim WILL boot Macs. In fact, the list is entitled "List of Mac-bootable WD external drives..."
And yep, mine is on there...on the list that reads "The following external hard drives should be bootable on Intel-based Mac computers systems through FireWire (1394a/b)" is "MyBook Studio" as well as my drive model number.
But that's all beside the point. Like you, I couldn't recommend their drives at this point. At least make sure if you buy one that the vendor has a good return policy.
Dave

[URGENT] Problems Booting from External HD

I'm at a complete loss on this one. I'm a pretty competent Mac geek, and even I can't figure this out. Bear with me, I'll try and explain my problem as best I can. First, some basic info:
My hardware setup:
• iMac G3 600MHz
• 1GB RAM
• 120GB internal HD, running OSX 10.4.7
The computer's internal drive is used by someone else for work during the day. I run all of my files and programs from a 2nd HD, which I boot from:
• Seagate 300GB HD
• Bytecc combo USB/Firewire drive enclosure
Software:
The only recent install I've done is Super Duper, which I did after I began having problems. I used it clone my Firewire boot drive to a (backup) 400GB external USB/Firewire drive, and I restored from the clone once when I began having the problems that now appear to have come back. At the time, it appeared that restoring from the clone had solved my problems. I'm fairly certain that my problems are software-related: I've installed the drive in question in another Mac (internally), S.M.A.R.T. status appears fine. I'm not using anything awful like Norton Disk Doctor, I've tried rebuilding the volume using DiskWarrior, without success.
Problem:
I am unable to boot from my Firewire drive. When I start up using it, everything appears normal, until I get to the boot panel. The progress bar loads very slowly, and only gets about halfway finished before the login panel appears on top of it (even though the boot drive is a single-user volume, set to login automatically). The username and password fields are both blank, and if I enter my username and password it says it's incorrect.
Symptoms:
• OSX/programs become unresponsive after waking from sleep. Computer freezes, and most recently the screen went completely gray. After forceably turning off the computer and HD and restarting, I get the problem I just mentioned with the login panel. I don't have any problems waking from sleep if I'm booting from the computer's internal HD.
• Certain programs (notably iTunes and Adobe CS2 apps) periodically become unresponsive and quit. Several times I've gotten an "unknown error" message from iTunes saying that it is "unable to save the iTunes library". Both of these issues usually precede the main problem of being unable to boot/login.
• Occasionally, if I boot from the computer's internal HD and then switch on the external, it refuses to recognize it as being a formatted OSX extended (journaled) volume. Turning it off for several minutes and then turning it back on sometimes fixes it, as does repairing it using Disk Utility.
These problems have been plaguing me for months now, and with more than one external HD (although using the same enclosure). Everytime I do something to fix it, the problems seem to go away for an increasingly shorter amount of time, before reappearing, each time slightly worse than before. I'm convinced all of the issues I've been having are in some way related, I just can't figure out how they're related (or what I can do to fix them). Hopefully, one of you can help me.
iMac G3 600MHz Mac OS X (10.4.7) 1GB RAM | 120GB HD (Internal) | 300GB HD (External) | 400GB HD (External)

I occassionally get a similar problem, when playing a corrupt video via mplayer. The scrren freezes and I have to poweroff. When I log back in no user and no password is valid, even when root is enabled.
Solution: replace from a cloan. You will need to boot from a good cloan before you can do this, and be able to retain the original permissions.
I use: sudo rsync -avE /private/var/db/netinfo/ /Volumes/vol-name/private/var/db/netinfo
PB 15 1.5 Ghz

MBP slow to boot and WILL NOT boot from external drive

I have two problems. First my friends MacBook Pro which is less than a month old is taking long to load. So I did a clean install without installing anything other than what came. Still slow to boot. Sometimes I see a light blue screen for a while before getting into the desktop. She complains of the beachball far too often. She says my MacBook is faster than her Pro, which is not right.
So I came down with my external LaCie drive, which I cloned from my iMac 24". I wasn't able to boot from the external (firewire) drive using her MacBook Pro. I thought my LaCie drive was bad or soemthing, but when I got home, I hooked it up to my MacBook and booted from the external drive just fine. I use SuperDuper to make a bootable clone.
So as it stands now, her computer is slow to boot into the OS, and it won't let me boot from my external drive. Does anyone have any idea what this could be? I did a clean install, used cocktail, etc. If it persists, I'll tell her to take it in.
Thanks,
Bryan

Robert,
I have no idea what you mean by Apple is not responsive to the issue. If you want help, please start a new topic thread so someone can help you identify the problem without the distraction of other people's problems around yours. Blaming people does not solve problems.
This is the link to post a new topic on this board:
http://discussions.apple.com/forum.jspa?forumID=1149&start=0
This is a user to user board. If you need help from Apple, call AppleCare directly here:
http://www.apple.com/contact/phone_contacts.html

How to transfer files after booting from external drive?

My fathers MB Air has been failing to boot, most likely due to lack of space on hard drive. I've come to the conclusion seeing as how its a 2014 model and he has 6 GB's of free space on his main dirve. I've managed to boot his MB Air from an external drive and now I need to know how to transfer his files to the external hard drive from the internal hard drive, while of course running on the external device. I apologise if this made no sense; trying my best here. If there is any more information required to answer my question please don't hesitate.

There are two backups to be concerned about. Your iOS devices can backup your App purchases to the computer (that can get big fast!) and it can also backup personal settings. Personal settings can be backed up to your iCloud account and Apple provides 5GB free space which is just enough to back up two devices. I suggest the personal data (basically how you have your iOS device configured) be backed up to the cloud rather than the computer. This will free up about 5GB. Once this has been done, open iTunes, select preferences, click on the Devices tab and you'll see the stored backups (if any). Delete each one.
The backed up apps are stored in the iTunes folder. Inside the music folder you'll find a folder labeled Mobile Applications. Good news: you can delete this folder (mostly) safely because it costs nothing to redownload apps if needed. Bad news: if the app is removed from the App store it can't be downloaded again. This has never affected me but it is a potential problem. My solution is that I don't backup my apps to the computer. In the rare event that I need to wipe my iOS device and restore it I've found that downloading the Apps again (which is done automatically for you, no need to remember what you had) takes no longer than restoring them from the computer's hard drive.

Mac Pro trying to boot from external drive instead of HD?

my osx was recently reinstalled at the Genius Bar due to a boot problem caused by a power outage. Now if i want to boot up
i have to unplug time machine first; it is possibly trying to boot from the external drive till i unplug it. What should I do?

I would have:
not let you go home without also buying
a 1500VA UPS
a new system drive
other drives as needed
start with a clean install of the OS to a new drive
Clone your system when you do get a good install and update (Apple only)
then clone again when you have all your apps in place
Don't assume anything works, in fact assume nothing will for now.

Trying to boot from external drive using Startup manager

Hello forum geniuses
I would first like to make an announcement...my loved and cherished iMac G5 has moved on to the next life. Something to do with the motherboard. Your thoughts and prayers are welcome...
But some part of her may live on! You see, we had the hard drive taken out and put into one of those Hard drive shells, so it now works as an external hard drive. I plugged it into another iMac G5 and it works fine as an EXHD. However, I have been working with some very complex Final Cut pro projects so I ideally I want to boot the computer from my original hard disk to preserve all of my file paths. Since it is the original system disk, it should contain an installed copy of Mac OS 10.4 and the original system folder, and it should work as intended, correct?
The problem is, when I hold down the "option" key at startup, I don't get my old hard drive (which is now an external plugged in through firewire, for those playing at home) as a bootable option.
Does anyone know where I'm going wrong here?

Thanks for the reply. A couple of things...
Using my iBook laptop, I booted from the original drive from my old computer and it worked perfectly. Startup manager allowed me to select it and it preserved all my settings and data without a hitch. Exactly what I WANT to happen on the other G5
Remember, this isn't a clone or a copy of my old hard drive - it is the ACTUAL hard drive with an enclosure that allows me to plug it in as an external - so it has to be made bootable, since it is the original.
Also, I can't transfer my data from the original hard drive to the other iMac because there is more than 200GB of data on the original and the other one only has a 120GB hard drive.
So I think the question is, if the standard startup procedure works on my iBook why isn't it working on the iMac G5?

Can't Boot From External Drive

Situation:
Prior to upgrading to Lion I used SuperDuper to create a copy of the existing internal hard drive on an new external drive (iOmega eGo 500GB).
Tested booting from the external disk and it appeared to work correctly.
Upgraded to Lion.
Several days later attempted to boot from the external disk (by setting the start up disk in the system preferenes ) but it fails.
The system always boots into Lion.
What I've tried:
Setting the start up disk through system preferences
Holding down the option key to select a disk on startup - interestingly enough I only see the internal hard disk and a recover HD. No sign of my external disk.
Using a clean partition on the external hard drive I installed SL from the retail DVD. This produces the same effect of system booting to Lion on the internal drive, which suggests that the problem is not related to the copy I made using SuperDuper, but rather has to do with the external drive or something in Lion that prevents using an external drive (but I've never heard of such a thing).
Talked to technical support at Apple since I had newly purchased Lion. They couldn't offer a solution but did give a lot of thought and suggestions - but they don't support booting from an external disk.
Talked to iOmega technical support. Not helpful but did figure out at the end of an online chat that they don't support their disks being used for external booting.
Emailed SuperDuper. Very helpful. They offered some suggestions but in the end these didn't work.
Characteristics
Lion 10.7.4
iMac 2007
External Drive Interface FW800
I'd appreciate any suggestions as to the cause of the problem and possible fixes.
Thanks

@shootist007
Still no success but more information:
I found the USB cable for the drive, connected it to a powered USB hub (note that there are two cables going into the hub that must merge and go into a single connector for the USB interface on the drive). with both cables plugged in I still can't get the external drive to boot.
I need to do one more experiment on this. The hub is fully loaded so I'll try removing as much load as possible on the USB to see if I can get it to work.
Regarding your question, there is no way to get power to the drive. (Now I think about it, the design is for a portable drive that you can carry around with you so iOmega aimed the design at not needing a power supply to make it very portable). Hmmm, didn't think about that when I purchased it.
If reducing the load on the hub doesn't make it work then I'l have to get a replacement drive with its own power supply.
Thanks for your help. Even though no success yet I suspect you've identified the problem.

Problems booting from external drives

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