I recently updated my Mid 2007 iMac with the latest OS 10.8.5 now my external hard drives will not show up. They show up when I boot them up on a machine running and earlier OS. Is there a fix for this?

I recently updated my 20-inch, Mid 2007 iMac with the latest OS 10.8.5 now my external hard drives will not show up. They show up when I boot them up on a machine running and earlier OS. Is there a fix for this?

Can you see them in Disk Utility?
If so, can you select and Mount them?
If not, disconnect them, reset the iMac's SMC and then reconnect them.
Intel-based Macs: Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
If you still can not see them, connect them back up to the iMac running the older OS, open Disk Utility and look to see how they are partitioned and formatted.

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My external hard drive will not open and only shows up in Disk Utilities. When I try yo repair it, it give me and error of invalid sibling link. How do I fix my external hard drive?

My external hard drive will not open and only shows up in Disk Utilities. When I try yo repair it, it give me and error of invalid sibling link. How do I fix my external hard drive?

Invalid sibling link may not be fixable by Disk Utility. (Disk Utility is very conservative, and will not attempt repairs that might cause you to lose data.)
It is an indication of serious Directory damage.
that leaves
a) third-party Utilities that will take those risks, or
b) re-initializing the drive (which deletes all your data) and restoring from another backup source.
c) "Copying off whatever files you can salvage" has gone by, and you cannot copy anything off a drive that will not mount. You may be able to use "rescue" programs such as prosoft engineering Data Rescue to copy files to another drive, but that sounds a lot better than its reality. You may get many files, but not get ANY filenames.

My Lacie external hard drive will not back up on Time Machine. Says there's not enough space. This has happened with every single external I've purchased. Thought TM was supposed to delete old backups??

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So, I won't be able to buy another bigger external since I've just purchased 3. Ugh. Well, I'll just exclude some files and divide things up. Eventually, I just want my 20,000 iphotos on one of the 1TB externals, and a TM back-up on another so that iphoto will function once more. It really hates how many photos I have and is brutally punishing me for it.I seriously need to do some housecleaning!
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i have a powerbook g4 aluminum. i have an external hard drive for it. a simple tech 100gig portable drive, almost brand new. i dont know what happened to it, but one day i was starting my computer up with it attached. it wounldnt fully start up, said "waiting for local disks" so i uplugged the external hard drive. now it wont mount and will only show up in the disk utility of my friends macbook. i tried to verify and repair, and this is the message i got.
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** /dev/disk1s1
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Im in mexico writing a book and so i really need help on this one guys.

Hi, hjbugs, and welcome to Apple Discussions. Disconnecting the drive while your Powerbook was accessing it probably caused your problem. It may be repairable using DiskWarrior or TechTool Pro, but if you don't have access to one of those and aren't going to buy one, reformatting the drive with Disk Utility may be the only other way to make it usable again. If it contains data you need to recover first (i.e., data that isn't also stored on your internal HD or other storage media), download the free demo version of one of the data recovery utilities mentioned in this thread and use it to see what is recoverable. If the files you need are recoverable, buy the full version of one of the utilities and recover them.

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Hello Everyone!
Needs some help resolving this issue. External hard drive (Toshiba v63600-C) will not mount anymore on my mothers-in-law's macbook air. She notice this problem starting on the Aug 6th. You can see it in the Disk Utility but is not mounted. I can get the her ext hard drive to mount on my Macbook Pro with no problem. I also tried my personal ext hard drive (Seagate) on her Macbook Air and it will not mount. Not sure what is going on here. Any help is appreciated in resolving this issue.
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Mount Point : Not mounted Capacity : 1 TB (1,000,096,367,104 Bytes)
Format : Windows NT Filesystem (Tuxera NTFS) Available : -
Owners Enabled : - Used : -
Number of Folders : - Number of Files : -
Actions Taken So Far:
1) Confirmed "external disk" is selected under Finder's Preference
2) Reset PRAM
3) Ran Verify Disk and Repair Disk under Disk Utility with no change.
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You may believe this is Apple's problem but I just like Baltwo have had absolutely no problems with any of my Firewire drives in Lion. So unless you can come up with much stronger evidence to the contrary, I doubt that your feeling are going to carry any weight at all.
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http://support.apple.com/kb/HT1151?viewlocale=en_US
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http://www.macfixit.com/article.php?story=20070824012114701
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My external hard drive will not mount with my mac?

Okay so everything was working out great till the new OS came out. Then i ran into some problems. I can no longer back up anything i have on my laptop anymore because my external will not pick up in finder-desktop-etc. I need help as fast as i can because i need to back up, its been 50 days and my computer is filled with pricless photos and videos that i would like to save.
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Time Machine - External Hard Drive will not unlock

Laptop: Macbook, OSX 10.7.5, 2.4 GHz Intel Core 2 Duo, 8 GB RAM
External: 320 GB, Seagate Free Agent Pro - 9KV2AA-502
I just bought this external a few weeks back and ran TimeMachine. Backed up my computer about 5 times since the purchase. I decided to encrypt my backups and set up a password.
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I was running out of hard drive space so I uninstalled Adobe Premiere Elements 13 with the intention of re-downloading it on my external hard drive. But now I have less space on my hard drive, and I can't find it on my external.

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I recently updated my Mid 2007 iMac with the latest OS 10.8.5 now my external hard drives will not show up. They show up when I boot them up on a machine running and earlier OS. Is there a fix for this?

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