2 different brand USB external hard drives not mounting- Firewire ok

Hi, first timer here so apologies in advance.
i have to different brand external hard disks and they both show up fine with a firewire connection. the trouble is that i need to use the usb connection and neither show up. (shows up in system profiler though but not disk utility.) why USB if i can use Firewire? I will be using the disk to connect to a Wii console via usb port and the Wii is not recognizing either disk either?
Any ideas on how to get one of these disks to mount by USB?
cables are fine as work with USB only hard disks.
Thanks in advance

Hello Bob,
Thanks for your reply.
Unfortunately it does not show up at all in "disk utility". But appears in System Profiler under USB. This is true of 2 different external hard drives that mount fine with the firewire cables. One is a 3.5 inch and the other is a 2.5 inch portable. The USB cable is not faulty as tested it with another USB peripheral. Now a big believer in coincidences. Am i doing something wrong?
any other thoughts?
thanks again

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External hard drive not mounting

external hard drive not mounting

I fixed mine by uninstalling the software that came with the harddrive such as Tuxera and reinstalled it now myharddrive works again and i did not have to delete the harddrive and reformat it.
I tried a lot like reseting the Pram And connecting other harddrives but by unstalling the original software it works all over again. I hope this works for you because i was getting pretty frustrated myself.
Im running a 2012 macbook pro with 10.9.3
boom mind blown

External hard drive not mounting on emac, works fine on windows xp machine

I am running an emac 1ghz powerpc G4 with 768MB sdram and version 10.4.9
I have an external hard drive that up to a few days ago ran smoothly. It contains all my itunes, iphoto, and imovie libraries.
Now it will not mount. It lights up, it runs, etc but I can't use it. I tried restarting machine etc. No avail.
it is a usb drive. Today I took it downstairs and plugged it into my daughter's windows xp machine. It recognized it right away (I was shocked too) and everything is there good as before.
I plugged it into every usb port in the emac and nothing. I am using the same cord on the xp and it works fine.
Any idea what it could be and how to fix it. I read on hear a lot to use disk utility. However when I run it it just freezes. When I turn that external drive off disk utility runs fine.

I am running an emac 1ghz powerpc G4 with 768MB sdram
and version 10.4.9
I have an external hard drive that up to a few days
ago ran smoothly. It contains all my itunes, iphoto,
and imovie libraries.
Now it will not mount. It lights up, it runs, etc
but I can't use it. I tried restarting machine etc.
No avail.
it is a usb drive. Today I took it downstairs and
plugged it into my daughter's windows xp machine. It
recognized it right away (I was shocked too) and
everything is there good as before.
I plugged it into every usb port in the emac and
nothing. I am using the same cord on the xp and it
works fine.
Any idea what it could be and how to fix it. I read
on hear a lot to use disk utility. However when I
run it it just freezes. When I turn that external
drive off disk utility runs fine.
Your external drive is formatted FAT32 or FAT, or the Windows box would have a problem seeing it. (Unless you have MacDrive on that box, that is.)
If it is formatted FAT32 or FAT, you are NOT going to be able to use Disk Utility (or any other Mac utility) on that drive. Disk Utility doesn't do FAT.
I'd copy the contents of the drive elsewhere then start up Disk Utility first and then plug the drive into the Mac and format it FAT32 from Disk Utility. If that doesn't work, format it FAT32 on the Windows machine. Note: if this drive is larger than 32 GB, you're going to need to generate two or more partitions, as while WinXP can read FAT32 partitions larger than 32 GB, it can't create them. Macs and Linux boxes can create large FAT32 partitions. Second note: if the drive is smaller than 4 GB, you might want to think about formatting it FAT instead of FAT32. Indeed, Windows may insist. Do not let Windows format it NTFS; Macs can read NTFS volumes, but can't write to them.

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Badly needed help!

I had the same info (with a WD essentials encolusre where I just replaced a 750 with a 2TB), but after closing both DiskDrill and Disk utility, the terminal worked. So have a look if there are any other disk monitorings on.
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I have never had problems with my external hard drive (I just bought it a few months ago), but suddenly it is not mounting on the iMacs at my work or my Macbook pro at home. The drive does NOT show up in Disc Utility, but when the drive is connected via USB, the light on the drive comes on and it is clearly operating. It will not mount on any mac product all of a sudden. I have no idea why this is happening someone PLEASE HELP thanks

you have a MacBook Pro, we are Mac Pro users.
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MacBook Pro 2009. 250 SD, HD 8Gb Ram.
I have had this issue for about a year...with no resolve!
Apple and the User community have not been able to solve issue.
I have had to work around it since the Oct 2013 Mavericks upgrade which “killed” (rendered unmountable) both my USB and Optical drives.
Hundreds of replies and remedies have not corrected my issue. Hundreds of replies stating that if there was a global issue it would of been fixed by Apple, not true. And dismissive replies stating that there must be a hardware issue are very discouraging.
So now, hoping to help the voiceless masses, I'm forced to share my experience.
As I stated, I have been having the issue since one of the Mavericks upgrades. The upgrade rendered externally attached drives unmountable...They are all seen in Disk Utility. They are just not mountable. Regardless of the flavor of the disk format, either Mac or PC, they are found, seen and refuse to mount. I can see them using Terminal commands, I can see them in System Report. I can reset all the memory I want...turn it off, reset, sleep, turn on, restart...NOPE...And the optical drive takes in disks but ejects them after an attempted mounting. Keep in mind, there are no physical issues with either USB or optical drives.
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Great news! The re-image of Mavericks proved to work! I WAS able to mount external drives attached! How is that possible? Don't know, don't care! It just worked! So happy!
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fwojciec wrote:I let my external ntfs drive be mounted by hal - I have no entry for it in /etc/fstab. In order to have it mounted with read/write privileges I had to create a hal policy like this wiki page describes: http://wiki.archlinux.org/index.php/HAL … ntfs-3g.29
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Hi Veena, Welcome to Apple Discussions.
And you've tried choosing the volume and pressing the "Mount " icon on the tool bar of Disk Utility?
Have you shut down your Mac and disconnected your firewire cable from both ends and let it sit about ten minutes then reconnect and try. Also, it is important to disconnect the AC power to your Mac, this helps to reset the FireWire port(s).
Do you have TTP or DW, both of which you could use to try to mount it.
It is also possible that you have a bad cable or a bad port, do other FW devices work?
-mj
[email protected]

External Hard Drive not Mounting any more

Hi all,
I have noticed since couple of kernel updates, my external hard drive - plugged via USB doesn't get mounted any more. To access the drive I need to reboot the computer with the hard drive switch on.
See below for the dmesg output, regular usb keys get mounted normally, I have check autofs set up and it seems fine compare to the wiki,
Many thanks for taking the time to read my topic,
Looking forward for your replies,
[ 37.753349] usb 2-6: new high-speed USB device number 4 using ehci_hcd
[ 38.139340] usbcore: registered new interface driver uas
[ 38.175765] Initializing USB Mass Storage driver...
[ 38.175829] usbcore: registered new interface driver usb-storage
[ 38.175830] USB Mass Storage support registered.
[ 38.240086] scsi8 : usb-storage 2-6:1.0
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[ 44.726882] scsi 8:0:0:0: Direct-Access ST325082 3A PQ: 0 ANSI: 0
[ 44.727768] sd 8:0:0:0: [sde] 488397168 512-byte logical blocks: (250 GB/232 GiB)
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[ 2243.446832] usb 2-6: USB disconnect, device number 4
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[ 2278.211117] scsi9 : usb-storage 2-6:1.0
[ 2285.078375] scsi 9:0:0:0: Direct-Access ST325082 3A PQ: 0 ANSI: 0
[ 2285.079220] sd 9:0:0:0: [sde] 488397168 512-byte logical blocks: (250 GB/232 GiB)
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[ 2285.080212] sd 9:0:0:0: [sde] Mode Sense: 33 00 00 00
[ 2285.081222] sd 9:0:0:0: [sde] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 2285.101763] sde: sde1
[ 2285.105212] sd 9:0:0:0: [sde] Attached SCSI disk
[ 2316.159787] usb 2-6: reset high-speed USB device number 5 using ehci_hcd

Yes I have checked System Settings -> Removable Devices - but there is no option for an external hard drive.
And yes it is a ntfs drive, but as I said it worked before couples of updates ago, and just to be sure I checked ntfs-3g - it is installed.
Oh, and I should have said, checking /dev/by-label the drive appear there once turn on, but doesn't get mounted, I use to have a line in the fstab file, but I removed it because it tried to mount it during booting process, and it work anyway.
Any other advice?
Last edited by sweetthdevil (2012-01-24 19:03:00)

External Hard Drive not mounting on Desktop

Hello,
I use a 250 gb Lacie external hard drive (firewire) for backup. For the past week, the external hard drive has mostly not been mounting on the desktop.
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Hi gavvx, and a warm welcome to the forums!
Feel free to start a new topic of your own will get more individualized attention, and many more helpers!
It can be hard to sometimes find where to start a New Topic, so here's the link...
http://discussions.apple.com/post!default.jspa?forumID=758
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Please help... External Hard Drive not mounting

Hello, Please help me if you can:
I have all of my data backed up onto a Seagate External Hard Drive, purchased just a few months ago. I just got a new laptop (MacBook Air) and need to get my data off of my hard drive, but it isn't showing up on my Desktop or Finder. It shows up in Disk Utility, but when I ask it to "repair" it says:
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The volume could not be verified completely.
Volume repair complete.Updating boot support partitions for the volume as required.Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files."
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I would be happy to back up the files as it says, but as it doesn't show up anywhere I can't find the files to access. Can anyone help me find a way to get the files off of the disk, or fix the disk so that it is readable?

Hi, Brian, and welcome to the Discussions!
You might perhaps launch System Profiler (from Applications/Utilities) and see if the device is listed there under the FireWire heading in Hardware Overview.
Can you hear the LaCie spin up when powered on?
You might download the free trial version of Data Rescue II and launch it to see if it recognizes the drive. This software often does when DW or Disk Utility won't. If it does, run a scan with it to see if the data on the volume is viewable.
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Johnk93 wrote:
Disk Utility sees the partition but can't mount or repair it and gives me the error "Invalid sibling link, unable to verify or repair."
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I have 3 x 4TB RAID0 G-Tech EHDs. One of them only works at all when connected via the USB socket on the 'old-style' plug-in keyboard (USB2) but will not mount at all via the USB3 sockets. (This query is in another post)
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I am sure that some will cringe at this
Note (my opinion) : I found when sharing with a Wintel box and Apple boxes it is better to use just smb. Mixing the smb AND afp arises to hang up problems and the afp is the side that seems to hang up the most. (that hurt me to type, I blame Finder - another story)
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2 different brand USB external hard drives not mounting- Firewire ok

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