OS X :: USB Pen Drive Won't Mount

Nov 17, 2010

I tried searching for a solution for this and can't find any. I've seen one other threat in here about similar problems but the variables in my case are different. Here's the thing, a friend of mine lent me her usb pen-drive. She uses it on a pc mostly at work. When she gave it to me she forgot to copy some files i needed so she plugged it into her macbook pro (one of the new ones from this year, intel, snow leopard and stuff), copied the files i needed on it and i took it home. I have an intel imac, bought on april 2009. I plugged the usb pen-drive on my keyboard usb port and nothing happened. So i took it out, plugged it in again and nada. I did it a 3rd time and this time it showed me a message saying that this pen-drive needed more power and i had to try plugging it into a different usb port. So i plugged it in the back of my imac and nothing happened, not even the "insufficient power" message. It doesn't mount, won't show up in the desktop nor in the sidebar of a finder window.

I checked the disk utility and the pen-drive shows up there. I see the "main" pen-drive and it's "partition" (i dunno how to call it... mmm... you know, like you're seeing the "parent" drive and its "son" drive but they're "one and the same") and i can see its tech info and i noticed it's formatted NTFS. Since it worked just fine on my friend's macbook pro, i can't figure out why isn't it working in my imac. I know macs can't write NTFS, only read (mine doesn't at least) but hers wrote info in the pen-drive no prob. Another thing i noticed is that the "son" drive is grayed out. I can see its tech info but it's grayed out. Verifying the drive simply shows a message saying "Verify volume failed: Invalid request.".

So, i have no clue as to what's going on. I could give it back and ask my friend to format it as journal or whatever it's called to be mac os compatible and copy the info back again, but i don't know if that'd be a solution until i'm able to try it in a few days. Can't ask her to format it fat32 since the file i need is larger than 4gb, so yeah. Any clues as to what could be the problem? I even tried unplugging any usb peripherals and no dice.

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Mac Pro :: Hard Drive Will Not Mount After Optical Drive Upgrade?

Feb 23, 2012

I recently performed an optical drive install. Had to remove the hard drive bays (I use three hard drives - Luckily, 2 run OSX).  I carefully removed all three drive bays and the empty bay. When I inserted the drives into the computer I had changed the position, swapping one OSX drive with a different one and reversing the drive bays. On restart, the computer started on the drive I had not selected for startup and I received an error message stating the other drive could not mount and it gave three options (Initialize - Ignore and Eject).  

I can see the drive in Disk Utility and repair the permissions (it's also located in the System Profile).  

I tried a few things I read in the community using various Terminal commands but was unsuccessful.   

(Let me point out that I recently switched from a PPC G5 to MacPro and swapped the drives from PPC into MacPro and all has been fine until I removed changed their positions in the bays) 

Mac Pro, Mac OS X (10.5.8)

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May 23, 2007

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Jan 3, 2009

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Sep 4, 2009

I installed SL today and everything seemed perfect until I tried to mount my USB HDD it's a Maxtor drive inside the case, the case is produced by Lace.

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It says I should check the drive with disc utility but when I do so it finds no faults.

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Hardware :: Recover Data From Dead Lacie Hard Drive / Unable To Mount Hard Drive

Sep 6, 2009

Today I went to plug in my Lacie 250 GB USB external hard drive into my 13 in. MacBook to get a shirt template for a design I am making. I discovered that the hard drive just would not mount and show on the desktop, and I remembered that this happened a few days before, but all I did was unplug it and plug it back in, and it worked... except that today, that didn't work at all. I tried the other USB port, and the hard drive showed up on the desktop for about a second, and then disappeared. I kept on replugging it back into both USB ports, but nothing happened.

Then I tried to see if it would work on the PC beside me, and it was recognized as an external device; however, a message came up telling me the drive was malfunctioning. I am guessing this is from ejecting it incorrectly (because I am in a hurry to head to my next classes...I use this laptop at school), but I have incorrectly disconnected it before in the past and this problem never happened to me before.

Every single project I have ever created for my design career is on that hard drive, and all I want now is to get my files back. All I need it to do is show up on the desktop for just the right amount of time for me to copy my files onto my computer.

I read online to put it into the freezer for a while and it should mount, but that didn't work. I tried using Disk Warrior, Data Rescue 3, and Tech Tool Deluxe, but the hard drive did not show up on any of those apps.I tried plugging the hard drive into an iMac as well, but it did not show up either.

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Oct 8, 2009

I recently bought a Lacie 2big Raid drive with 2 x 1 TB drives for backup of my images (I'm a photographer).

Everything was fine, mounted the drive, formatted, and used SilverKeeper to transfer all my previous work onto the drive which was formatted with RAID 1 (mirrored).

The files all seemed to transfer across fine, size was the same, and I had a quick flick through the drive and images where all ok. So needing to use the drive that these images CAME off, I formatted that, and put that to use where it was needed.

So in summary I had the Lacie RAID 1 as my 2 sources of backup at this point. I thought everything was fine at this point.

Now maybe a few months on when I have to track back for files, I noticed quite a few folders had been corrupted, for example, opening a job folder, and every type of image file, jpeg's, tiffs, and PSD's would all say they are corrupt when I tried to open them in Photoshop. Some of these jobs where 20GB of RAW and edited images, all corrupt.

So, reading through my manual for the Lacie, it said I could remove the 2nd drive, without altering the 1st drives data.

With this I removed the second drive, trying to narrow out any problems with the RAID. Mounted the disc, same corrupt files.

I then replaced the second drive back to the RAID, which the instructions said was fine, and it would just rebuilt the mirror, so I left if for a few hours while it rebuilt the second drive.

Now my problem, the RAID has finished mirroring the drives, and now my MacPro or Powerbook won't let me mount the drive without formatting it which I obviously can't do, It brings up Disk Utility when the drive is switched on and wants me to format the drive to mount it.

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Oct 22, 2009

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The upper level drive shows up in Disk Utility, but the partition of the disk I would like to mount (the only partition on the drive) is greyed out. I know that it's formatted for a Mac and has been accessed recently.

In Disk Utility, when trying to mount or eject, the an error comes up saying to use first aid. Verify and Repair Disk don't change anything though.

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Jul 27, 2010

I have an external hard drive (NTFS) hooked up via firewire to a firewire audio interface, hooked up to my Macbook Pro with OS X 10.6.4. I accidentally turned off my firewire interface before ejecting the hard drive. (I have done this before, it's hard to remember I have my hard drive on sometimes, and nothing bad has happened). When I turned the hard drive back on, the mac says "the disk you inserted was not readable by this computer." I can pick "Initialize..." "Ignore" or "Eject"

If I click Initialize, I can't repair the disk or anything because it is NTFS.I tried booting into Windows 7, and it does not recognize the drive either.

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Dec 6, 2008

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Does the mac hard drive need to be set so it can accommodate a slave drive?

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Intel Mac :: Cannot Mount An External Drive

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Disk first aid sees the drive but the "mount " button is dim. I am connected by a usb cable. I am using Lion 10.7.3. 

I had been using the drive connected to an airport extreme. That configuration failed its connection to my imac. The drive is now connected now directly to the computer. .

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Apr 25, 2012

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Jul 25, 2010

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Dec 29, 2008

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Jun 19, 2009

Long story short I dropped my 500GB Maxtor external HD (which is really just an internal HD in a chase). The drop was about 3 ft. It was not on so I don't think there will be much damage to the disk, but it no longer mounts. I was wondering if anyone could think of a way to get the disk to mount so I can recover files saved to it. I have Tech Tools, and Data Rescue II to recover the drive but as long it is not being recognized by the computer those applications are useless.

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Jul 26, 2009

I am new to this forum and hoping for some advice with this hard drive issue.

I opened a brand new Lacie 500 GB Hard Drive. It is connected to my macbook via usb. I selected it as my hard drive destination in Time Machine and ran the backup option.

The hard drive did mount. About 5 minutes in the backup option failed - a time machine error: time machine backup failed.

I ejected the drive and unplugged it/turned it off and rebooted my laptop. Now the hard drive does not mount on my desktop however will show in disk utility. It lists with the Lacie name and another subdivision under the name.

When I try disk repair, erase or partition..I always get the same message: resource busy. After the error, the hard drive subdivision disappears leaving only one name on the list in disk utility. (It does not have the name underneath it).

I apologize for my semi technical description. I am new to mac and appreciate any advice on how to fix this issue. All I want to do is backup my laptop using the new hard drive with time machine.

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Aug 17, 2009

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Oct 5, 2009

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This morning, just after I'd begun copying some of these files to another external drive, the WD drive went down, and now will not mount/showup in Finder. It DOES show up in Disk Utility, though with the Time Machine volume grayed out. I get a "could not mount" error when I click on the "mount" icon, and nothing else I try (rebooting, unplugging drive power supply, etc). has worked. I'm trying to avoid the erase-and-reformat option, because I'd lose some potentially valuable images.

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Jan 24, 2010

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May 17, 2012

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May 21, 2012

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Jun 1, 2012

I disconnected a working external 750 Gig G-Drive.  When I reconnected it, it won't mount.  I have restarted the computer.  I have disconnected & re-connected the drive.  Still no luck.  What should I do?

iMac, Mac OS X (10.7.4)

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Jun 12, 2012

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