USB drives don't mount

I have a problem with my brand new macbook. When connecting usb thumb drive or external usb hard drive to the computer nothing happens. There isn't disk image on the desktop or in the finder sidebar. The drive doesn't show on disk utility.
With thumb drive there isn't any system messages at /var/log/system.log or any events with dmesg.
With the external usb drive there is following message at /var/log/system.log
USBF: 29698.842 AppleUSBEHCI[0x557e800]::Found a transaction past the completion deadline on bus 253, timing out!
How ever, if I connect usb universal card reader to my macbook and insert memory card from my digital camera is is recognised. So the port is functioning fine with that.
What should I do to get the system working with my usb drives?
I've updated my system to the latest with software update.
murkus

Hi Murkus,
try to reset your PRAM to "refresh" your usb port.
Check the thumbdrive and external HD web site for firmware updater / patch on their sites.
And if you have power adapter for the external. try to use that too, or use Y usb cable to connect both end on one side to macbook to get more power and the other single end to your external.
Also try to leave those connected and restart your macbook, hopefully it will mount during start up process.
Good Luck.

Similar Messages

External USB drive won't mount after 10.9.5 upgrade

Is anyone else reporting the following issue? Immediately after installing OS X update 10.9.5 (13F34) on 09/18, my external USB drive (IOMega 1GB OS X Extended FS) used for Time Machine would no longer mount and isn't recognized. When I look at the drives in finder, it is missing. However, it does show up under the USB Hi-Speed Bus device tree:
USB Mass Storage:
Product ID:    0x0376
Vendor ID:    0x059b (Iomega Corporation)
Version:     0.00
Serial Number:    ABCDEF012314E2ED
Speed:    Up to 480 Mb/sec
Manufacturer:    Iomega
Location ID:    0x1a120000 / 3
Current Available (mA):    500
Current Required (mA):    0
Console message when device plugged in:
10/6/14 3:22:31.000 AM kernel[0]: USBMSC Identifier (non-unique): ABCDEF012314E2ED 0x59b 0x376 0x0, 2
mount command results:
devfs on /dev (devfs, local, nobrowse)
map -hosts on /net (autofs, nosuid, automounted, nobrowse)
map auto_home on /home (autofs, automounted, nobrowse)
/dev/disk1s2 on /Volumes/Mac-Mini 2 (hfs, local, nodev, nosuid, noowners)
System is Mac-Mini (late 2012), 2.5 Ghz i5, 8GB ram, 500GB local storage, 1TB on second Firewire disk for media, 1TB USB disk for Firewire (PROBLEM)
I have reinstalled the combined 10.9.5 OS upgrade, and verified that the drive works when connected to my other MB Pro (mid-2012 running Yosemite beta 3). There is no third party software that I'm aware of in use for this drive, as it's only for Time Machine backups.
Thanks

Is the drive's icon on the desktop (perhaps behind another icon, which is possible if Finder > View > Cleanup is enabled)?
If not, is the box Finder > Preferences > General > External Disks checked?
Is the drive listed in every Finder window's sidebar?
If not, is the box Finder > Preferences > Sidebar > External Disks checked?
Are Time Machine backups to the drive happening on schedule?
If not, does the drive appear in System Preferences > Time Machine > Select Disk?
Can you open /Volumes/Mac-Mini 2/Backups.backupdb using Finder > Go > Go to Folder...?
Does the drive appear in Disk Utility? Is it (or can it be) mounted there?
Have you tried to plug it in to a USB port on the Mini (not a hub) or into a different USB port on the Mini?
Have you tried this: shut down; unplug the drive; boot the Mac; after you have logged in and the Finder is done populating the desktop and menu bar, plug the drive in?

Separate /var resiserfs partition on usb drive won't mount on boot

It has mounted successfully a few times. I set it up because I don't want /var on my Revodrive, and I've added a label (var) to the partition. I've tried mounting at first by UUID, then label, then strictly by dev (which isn't an option considering the number of block devices I have attached at any given time).
I have to manually mount var afterward, and this causes all sorts of hal problems with KDE, such as not being able to see my hard drives in Dolphin.
Any ideas? I have another mechanical HDD that I'm going to be using as a download drive, so I could locate var there if needed.
Here is my daemons array in rc.con:
DAEMONS=(dbus hal network rpcbind nfs-common syslog-ng samba sshd alsa sensors netfs)
and fstab
devpts /dev/pts devpts defaults 0 0
shm /dev/shm tmpfs nodev,nosuid 0 0
/dev/mapper/sil_bgbgdjaddicbp1 / ext4 defaults,noatime 0 1
/dev/mapper/sil_bgbgdjaddicbp2 /home ext4 defaults,noatime 0 1
UUID=31061fe9-f3de-40d3-93da-c0fce7ed5014 /boot ext2 defaults 0 0
#UUID=7fb98876-0e33-44b8-90e4-f2a103dd0166 /var reiserfs defaults 0 0
/dev/disk/by-label/var /var reiserfs defaults,noatime 0 0
none /tmp tmpfs nodev,nosuid,noatime,size=1000M,mode=1777 0 0
shm /dev/shm tmpfs nodev,nosuid,size=6G 0 0
Last edited by DarksideEE7 (2010-12-23 10:16:59)

stqn wrote:Someone will probably come up with a better solution, and I don't even know if that will fix your problem, but you could try adding "usb" to the beginning to the HOOKS line in /etc/mkinitcpio.conf. I think it is needed to be able to boot from a usb disk. (You'll have to run "mkinitcpio -p kernel26" afterwards.)
That makes sense. I actually prefer using the sata drive as /var, but I was just interested as to why it wasn't mounting.
BTW I have GRUB and boot installed on the same USB drive (from which I boot), then it mounts the root and home partitions on my OCZ Revodrive. This drive is essentially fakeraid with an sil satalink controller, and I was never able to get grub installed on the dmraid setup. I just gave up. It actually works quite well though.

External USB drives will not mount under Mountain Lion

Since upgrading to Mountain Lion, two external USB2 drives that I have will not mount and cannot be viewed in the Finder. The same occurs on a 2012 MacBook Air, a 2009 iMac 27 and a 2010 MacMini, all running OS X Mountain Lion version 10.8.2.
Both drives are Samsung Story external USB drives (one is 1.5 GB and the other is 2 GB) and both have been formatted using Mac Disk Utility with a single Mac OS Extended (Journaled) partition, one using Snow Leopard and the other with Lion.
Both still mount correctly on a friends MacBook Pro that is still running Snow Leopard, and I had no problem with the same drives under Lion. Interestingly both can also be connected to Time Capsule USB port and show up correctly.
Both drives mount correctly under Windows 7 on BootCamp partitions that I have on both the 2012 MacBook Air, a 2009 iMac 27. These BootCamp partitions have Paragon HFS+ installed so I can read Mac formated drives.
Both drives show up in Disk Utility, but when attempt to mount the drives I get the message "The disk could not be mounted. Try running First Aid on the disk and retry mounting." I can run Repair in First Aid on the disk and get the message that the volume appears OK, but again have the same problem when I attempt to mount the disk.
I have also tried using Disk Utility 3,2, but still cannot mount the drives, though the program indicates there is no problem with the drives.
I have other portable USB including a Samsung portable USB2 drive, and two external USB3 drives, and I don't have problems with them.
There is clearly a problem with Mountain Lion with accessing (mounting) these Samsung Story USB drives, and the problem appears to be with Mountain Lion itself as the problem did not occur on the same Macs with Lion and does not occur with Bootcamp partitions on the machines.
I have a lot of time searching forums, but I have not found anyone with an identical problem.
I sure hope someone can help or that Apple come up with a fix for this issue which has only developed since the update to Mountain Lion.

bj10au wrote:
Since upgrading to Mountain Lion, two external USB2 drives that I have will not mount and cannot be viewed in the Finder. The same occurs on a 2012 MacBook Air, a 2009 iMac 27 and a 2010 MacMini, all running OS X Mountain Lion version 10.8.2.
Both drives are Samsung Story external USB drives (one is 1.5 GB and the other is 2 GB) and both have been formatted using Mac Disk Utility with a single Mac OS Extended (Journaled) partition, one using Snow Leopard and the other with Lion.
Both still mount correctly on a friends MacBook Pro that is still running Snow Leopard, and I had no problem with the same drives under Lion. Interestingly both can also be connected to Time Capsule USB port and show up correctly.
Both drives mount correctly under Windows 7 on BootCamp partitions that I have on both the 2012 MacBook Air, a 2009 iMac 27. These BootCamp partitions have Paragon HFS+ installed so I can read Mac formated drives.
Both drives show up in Disk Utility, but when attempt to mount the drives I get the message "The disk could not be mounted. Try running First Aid on the disk and retry mounting." I can run Repair in First Aid on the disk and get the message that the volume appears OK, but again have the same problem when I attempt to mount the disk.
I have also tried using Disk Utility 3,2, but still cannot mount the drives, though the program indicates there is no problem with the drives.
I have other portable USB including a Samsung portable USB2 drive, and two external USB3 drives, and I don't have problems with them.
There is clearly a problem with Mountain Lion with accessing (mounting) these Samsung Story USB drives, and the problem appears to be with Mountain Lion itself as the problem did not occur on the same Macs with Lion and does not occur with Bootcamp partitions on the machines.
I have a lot of time searching forums, but I have not found anyone with an identical problem.
I sure hope someone can help or that Apple come up with a fix for this issue which has only developed since the update to Mountain Lion.
You can start here
http://support.seagate.com/kbimg/flash/213059/213059_EN.HTML
Pete

USB Sticks don't mount

After having returned from a two week vacation my 2 USB-Sticks (SanDisk 1 G and Yakumo 512 MB) suddenly don't mount anymore. If I start DiskUtility it keeps spinning and spinning, if I pull the Stick out DiskUtility stops spinning and shows the stick (which isn't there anymore). This happens on all three OS-X systems I have! I cannot even reformat the sticks. I have all the latest updates installed.
Frans

I hope you didn't have valuable data on your USB sticks.
If you can't get them recognized and formated by Disk Utility on 3 different computers, I'd try to return them to the store.
There's no perfect solution for file storage. (Flash based) USB sticks, harddrives, DVDs can fail without warning you, so you should always keep backups available. Read http://www.thexlab.com/faqs/backuprecovery.html and search this forum. There are other utilities like Carbon Copy Cloner (free) and Superduper. You don't have to use Retrospect.

USB Drives (Fat formatted) mounting and size issues

Hello all,
Not really a major pain in the rear but rather a question as to whether anyone else has encountered this problem.
I have a kingston Data Traveler usb drive 256mb. When connected to my Intel mac mini dual core, and then disconnect it to copy drivers to an XP laptop. Upon reconnecting the drive to the mini, i find that it would not remount until i log out and then back in again. This does not happen all of the time however.
And the other issue...
When deleting anything from the drive the info states that the amount of space available is still the same as before the deletion. When you check the size of the .trashes icon it is around the same size as the files/folders deleted. This is the same even when dismounted and then remounted if it does.
If anyone has experienced these issues and found a solution, please let me know.
Many thanks

Can't beleive how stoopid i was for posting this problem. Just remove the trash when the stick is in. Duh

Usb drives don't work

i've got some usb drives and even a usb hard drive that i've been using between my 10.3.9 powerpc and 10.4.11 intel. i've been switching them out no problem for weeks but all of a sudden my 10.3.9 computer doesn't see usb anything anymore. no thumb drives, no hard drives. my usb hard drive lights up but the computer never sees it. any ideas?

Look at these links.
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151?viewlocale=en_US
Common fixes for USB device issues (unrecognized, etc.)
http://www.macfixit.com/article.php?story=20070824012114701
 Cheers, Tom

External USB drive won't mount without running Repair Disk

I have a Seagate external USB hard drive. It's a 1TB FreeAgent drive that's USB powered. I use this to share data across several computers. Every time I connect the drive to my MacBook Pro, it does not mount. If I try to mount it, I'm told to "try running first aid".
So, I run repair disk, and then it will mount. I just did this, and Repair Disk reported "The volume /dev/disk1s1 appears to be OK".
Any help on this matter would be appreciated. It is formated NTFS, and I have an NTFS driver installed, if that makes any difference.
Thank you!

Is the drive's icon on the desktop (perhaps behind another icon, which is possible if Finder > View > Cleanup is enabled)?
If not, is the box Finder > Preferences > General > External Disks checked?
Is the drive listed in every Finder window's sidebar?
If not, is the box Finder > Preferences > Sidebar > External Disks checked?
Are Time Machine backups to the drive happening on schedule?
If not, does the drive appear in System Preferences > Time Machine > Select Disk?
Can you open /Volumes/Mac-Mini 2/Backups.backupdb using Finder > Go > Go to Folder...?
Does the drive appear in Disk Utility? Is it (or can it be) mounted there?
Have you tried to plug it in to a USB port on the Mini (not a hub) or into a different USB port on the Mini?
Have you tried this: shut down; unplug the drive; boot the Mac; after you have logged in and the Finder is done populating the desktop and menu bar, plug the drive in?

[SOLVED] How to automatically mount USB drives with custom mount point

edit:
Original title was : 'Unable to mount USB disk via /etc/rc.local', but got changed since the /etc/rc.local problem isn't relevant for me anymore.
Hello,
Since I am new to this forum, I'll start off with this :
Thanks to archlinux, its founder and all its contributors, cause this is the operating system (flavour) that annoys me the least.
The root problem :
I want to automount USB storage devices to other places than /media/ and without the need for programs that depend on gnome and the like. As I tried some stuff with hald and such, I didn't really get to a nice and easy to configure solution. Any hints in that direction are always welcome.
For now, automount of known USB storages devices during boot, will do.
So the things I tried and didnt work :
1.
Provide the disk info to /etc/fstab (via the disks UUID and 'auto' filesystem)
Add 'mount /mountpoint' to /etc/rc.local
Result : the mount command in rc.local says '... specify filesystem'
However, after boot, running /etc/rc.local mounts the USB disks correctly.
2.
Provide the disk info to /etc/fstab (via the disks UUID and the correct filesystem)
Add 'mount /mountpoint' to /etc/rc.local
Result : pc doesn't get through boot process and gives me the 'ctrl-d to reboot or root passwd for maintenance'
3.
Provide no disk info in /etc/fstab
Add the full mount line to /etc/rc.local (mount -t fs /dev/disks/by-uuid/MyUUID /MyMountpoint )
Result : don't remember the output of the mount execution, but well, it didn't mount
However, after boot, running /etc/rc.local mounts the USB disks correctly.
Is there something that isn't loaded at the time of rc.local execution that I need for mounting of USB devices ? Or why else is this failing ?
Regards,
BasiK
Last edited by BasiK (2009-08-28 07:22:50)

Thanks for the hint hunterthomson, but the pc I will be using it on, is an own-built HTPC/home file server, so there is no way I want to use a graphical file manager to get the usb disks mounted.
I tried to figure out a little about udev rules, and I got to do what I wanted to do, so thx for pointing me in that direction Mr.Elendig.
Btw, I am indeed also using auto-sleep/park disks, but this udev way works perfectly.
I added two rules files to /etc/udev/rules.d/ :
The first for a known usb disk (with its volume uuid), with a named mountpoint under my media dir /symbiosis/ :
[basik@plox ~]$ cat /etc/udev/rules.d/80-usb-utopia.rules
ACTION=="add", KERNEL=="sd[b-z][0-9]", ENV{ID_FS_UUID}=="a59332c2-07ba-4c52-afb5-20e361bdf71a",SYMLINK+="usb-%n", GROUP="storage", NAME="%k"
ACTION=="add", KERNEL=="sd[b-z][0-9]", ENV{ID_FS_UUID}=="a59332c2-07ba-4c52-afb5-20e361bdf71a",RUN+="/bin/mkdir -p /symbiosis/utopia"
ACTION=="add", KERNEL=="sd[b-z][0-9]", ENV{ID_FS_UUID}=="a59332c2-07ba-4c52-afb5-20e361bdf71a", RUN+="/bin/mount -t auto -o rw,noauto,sync,dirsync,noexec,nodev,noatime /dev/%k /symbiosis/utopia", OPTIONS="last_rule"
ACTION=="remove", KERNEL=="sd[b-z][0-9]", ENV{ID_FS_UUID}=="a59332c2-07ba-4c52-afb5-20e361bdf71a", RUN+="/bin/umount -l /symbiosis/utopia", OPTIONS="last_rule"
The second for unknown usb disks, to mount under the same dir. This is simply taken from the archwiki http://wiki.archlinux.org/index.php/Ude … .26_Tricks
Make sure these rules are executed after the ones for specific usb disks.
[basik@plox ~]$ cat /etc/udev/rules.d/usb-disks.rules
KERNEL=="sd[a-z]", NAME="%k", SYMLINK+="usb%m", GROUP="storage", OPTIONS="last_rule"
ACTION=="add", KERNEL=="sd[a-z][0-9]", SYMLINK+="usb%n", GROUP="storage", NAME="%k"
ACTION=="add", KERNEL=="sd[a-z][0-9]", RUN+="/bin/mkdir -p /symbiosis/usb%n"
ACTION=="add", KERNEL=="sd[a-z][0-9]", RUN+="/bin/mount -t auto -o rw,noauto,sync,dirsync,noexec,nodev,noatime /dev/%k /symbiosis/usb%n", OPTIONS="last_rule"
ACTION=="remove", KERNEL=="sd[a-z][0-9]", RUN+="/bin/umount -l /symbiosis/usb%n"
ACTION=="remove", KERNEL=="sd[a-z][0-9]", RUN+="/bin/rmdir /symbiosis/usb%n", OPTIONS="last_rule"
These may not be the nicest looking udev rules, but it works for what I wanted to do with it.

External Firewire Drives Don't Mount.... i need a guru.

Warning!!!!!
i'm going to ramble....
2 much sake .. heh heh
i just got a brand butt spanking new iBook G4 14" 1.42 GHz
Tiger pre-installed.
I ran Software Update. As you can tell by my info, i'm at 10.4.2 now.
In a minute i'll tell ya how i got BACK to 10.4.2 from 10.4.5
When i got my iBook I didn't plug my external firewire drives in until (about 2 days) after my update. So when i did get around to building my iTunes library, well, no luck.
My firewire drives would and do NOT mount!
By the way these particular peripherals are Western Digital firewire
http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?p_faqid=694&pcreated=1036793224
and AcomData Combo USB 2.0/Firewire
http://www.acomdata.com/hdp/fs.html
drives.
With a little exploration you'll find (at least i did) that they do not have firmware or driver updates for Mac. ( if you find them i'll give ya praise!)
The AcomData drive mounts with USB but not with firewire. The thing that
creeps me out is that my 3rd Gen firewire enabled iPod mounts right up no prob!
Another thing that ties me in knots is that these drives WILL MOUNT on my iBook12" running 10.3.9, as well as my old 5cH00L iMac DV 10.3.9!!!!
I thought it might be the Update so i did a clean install with the dvd provided by Apple and now i'm back to 10.4.2 but still no luck.
I've tried repairing permissions, starting, restarting, rebooting, plugging, unplugging, Updating, Downgrading, standing on my bloody head, looking all over the dotcom.
i swear i did all this with my peripherals unplugged.
i caught wind that though these companies may not provide updates for Mac, if i were to find out the companies that make the "chipsets?" within these drives that i might have luck.
i can't figure out what kind of "chipsets" (Oxford?) are in these drives or what to do if i knew anyway!
exhale
i still believe i have the best machine on the planet right now but .......
i need a guru.
help.
much obliged,
Clive
 G4 iBooks. iMac DV (graphite). gen 2,3,5 iPods Linux on the Pod too! Mac OS X (10.4.2)

Hi, Clive.
Here is some general troubleshooting advice that may help:
(1) Review the AppleCare Knowledge Base document "What to do if your computer won't recognize a FireWire device".
(2) If this problem occurred after installing a recent Mac OS X Update, and you are also unable to mount CDs, DVDs, or disk images perform the steps in this Mac OS X Hints article.
(3) The following additional steps will often help resolve problems with FireWire devices, particularly hard drives:(a) Power-on the FireWire drive before starting up (booting) your Mac.
(b) Reset PRAM and NVRAM.
(c) Reset the PMU or SMU: In the case of your iBook, I believe the article you want is "Resetting PowerBook and iBook Power Management Unit (PMU)." You can also check the manual that came with your new iBook.
(d) Try a different FireWire port. James Wiebe, CEO of WiebeTech, has published FireWire Port Failures in Host Computers and Peripheral Devices, a white paper providing backgroud information and technical analysis concerning the causes of failure for FireWire ports. This may provide additional diagnostic information.Note that some of the information above is from the "FireWire Problems" chapter of my book, Troubleshooting Mac® OS X.
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

Firewire drives don't mount after 10.4.3 update

G3 B&W
OS 10.4.2
Everything working fine with 10.4.2. Two 3rd party external firewire drives mounted and working. Had not installed any 3rd party drivers. Updated to 10.4.3 and neither will mount. Don't show in System Profiler either. Is fix to "back up" to 10.4.2? Help?
Bill Bevan
Offline: [email protected]

Matthew,
Thanks for the tip but the disconnect/power down didn't work. I also zapped the PRAM. Additional information: Firewire drives do mount when running OS 9.2.2 alone. Under OS 10.4.3 System Profiler does not show any Firewire devices. Of course, I could boot up Classic in 10.4.3 but that seems like the long way around, and I am in the process of weaning myself off of OS 9.
I noticed from some recent posts that a lot of people are losing device connectivity when updating to OS 10.4.3.
bgbevan(Bill)

FireWire drives don't mount

Hello everybody,
my trusted LaCie 500GB and 250GB drives worked flawlessly since I bought them. Since two days they are not mounting. About a monthe ago I upgraded from 10.3.9 to 10.4.7. Everything worked fine.
I very frequently repair permissions and use Onyx for maintenance of my computer. I reset PRAM and VRAM. I did the power cycle suggestion, turning ewverything off, unplugging all devices, unplugging all power supplies etc.
All to no avail.
My system.log in console reads every second over and over again:
... -Computer kernel[0]: AppleFWOHCI_AsyncTransmit::waitForDMA - context not going inactive.
My console.log continuously repeats:
...-Computer root[175]: [MAFL] attempt to make FSSpec for "121-210.cypress" failed -120\n
...-Computer root[175]: [MAFL] attempt to make FSSpec for "210.cypress" failed -120\n
...-Computer root[175]: [MAFL] found no firmware to load for 210\n
Is there anyone who can help me, please?
I am at the end of my knowledge.
Thank you!

Thank you again for your reply.
I did try the HD on my friends older PB and all was fine.
Resetting the PMU did not solve the problem.
All other applications (but Logic, because I could not access my files) were running smooth.
Going back to 10 a.m. yesterday, basically starting over, there was one thing I missed checking: the AC to DC converters supplied by LaCie for their drives.
Voilá! Individual testing revealed, that the AC/DC converter for the first LaCie drive in my chain did not spin up any of my other six LaCie drives (which I never run all at the same time).
Changed power supply and now I am back to the fast speed and glitch free system I love. Back to enjoying work as well
Thanks for your suggestions. I appreciate them very much.

Script parses, but some drives don't mount?

I have Kanaka 2.7 working and mounting volumes from one server, but it won't mount the drive located on another server. I can go to the Mac and mount the drive manually, so I know the login and AFP protocols are working correctly.
Any ideas?

See anything interesting in the Kanaka engine logs? Have you tried more
than one user? Have any other (dev/test/qa/prod) environments that work
differently? What are these two servers running, OS, SPs, services, etc.?
Good luck.
If you find this post helpful and are logged into the web interface,
show your appreciation and click on the star below...

Internal working Drives Don't Mount

My Machine;
Model Identifier: MacPro4,1 (Nehalem).Quad-Core Intel Xeon, 3,32 GHz,Number Of Processors: 1, Total Number Of Cores: 4, Memory: 8 GB
I inserted 3 additional Hard disk in the various slots.
System Profiler and Finder only display 3.
Each drives works and each slot works, however the machine seems to be unable to mount them all.
I moved the drives to every slot and each mounted but only showing 3. All other HD Utiities did nothing (Disk Worrior, and so on). Which Drives mount s Random.
What can cause this problem?
My machine was made in Ireland, I wanted more power: the Apple store assemblet it accortding to my needs.
The disk Iwnat to insert are 1 t or 2T. I t seems as if the Nehalem does not care about the capacity of the drives. I can mount 3 for a total of 5 tb, or still 3 GHD for a total of 5TB. In other words the capacity of the drives makes no difference, only the number.
The Apple Store doesn't understand this problem and suggest asking this community as my Mac Pro works perfectly and uses his original System Snow Lepard which is ok to me (I dislike Leos as they Killed Rosetta for mysterious reasons)
Regards
Message was edited by: etnad

I'm sorry but probably I was unable to write my question: I will try again.
If I added 3 drives to my Mac in the 3 empty drivew slots available in my configuration.
Once booting, one of them RANDOMLY does not mount.
I have a Western DIgital Original with 10.6.8 System in it which came with the Machine. I never wanted nor attempted to initialize it.
I purchased
disk A (Western DIgital 1TB)
disk B (Western DIgital 2TB)
)disk C (Western DIgital 2TB)
All drived initiaiized with GUID, none of them hss more than one partition.
Not mounting RANDOMLY means at times with the original system the Mac mounts disk I get Disk B and Disk C
other times mounts disks A and disk C
other times mounts disks A and disk B
This suggest that the capacity of the disk is irrelevant.
Each drive functions perfectly according to every available tests, Systme Profiler, Disk Warrior and othe Utilities
They all display Make, Model, capacity and free space.
To perform the test I removed one drive so the machine had only 3 drives to mount.The drives mounted quickly and went through the Verify disk and Replace Directory (in DISK WORRIOR)without any problem.
After swtiching off I moved the drives arounf in the 4 slots and gotthe same succesuful result.
I repeated the testwith every drive in every slot..
I also instlled each drive in every of the four available slots in my MACPRO to make sure each slot hardware they worked
Every time rebooting the Mac with 3 Hard Drives in any of the slots was succesful
Every time I attempr rebootimg with 4 drives (one in every slot) the Mac only Mounts 3 drives.
YOur reply tells me you did not read my post attentively enough
My Local Apple store thinks is a Power Problem, as if the power is unable to mount the machines ... but this is only a guess -

Just installed 7.2 now usb drives will not mount

Only one slot in the back works. they all worked, front and back, untill I upgraded to 10.7.0 and did the updates to 10.7.2.
I have a Mac Pro, Early 2009, 8Gb ram.

I'd put the blame on Lion changed USB external drive support for some types/makes bridges used.
For some, FW stopped but USB still worked.
Do USB ports work iwth other devices or none at all?
Willing to buy and install PCIe USB card?
run AHT yet?

USB drives don't mount

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