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Any suggestions?? View answer in context. Time Machine suddenly stopped working, only to give me the "delayed" error. And my machine no longer recognized the external hard drive. Desktops Speciality level out of ten: 0. Feb 2, PM in response to kreesetaylor In response to kreesetaylor I am having this same problem.

Then when I restarted the machine just gave me a grey screen and wouldn't boot until I disconnected the drives. Now the drives won't show up in the finder. I can see them attached using system profiler but I can't access them. This is really frustrating. Anyone have any solutions? Have had close to a dozen backups successfully performed on each machine. Yesterday, my Seagate went to back up the MacBook, and time machine displayed a message that it could not read the previous backup and needed either to erase it or create a new one something like that anyway.

It backed everything up from scratch -- took about mins. After that backup was completed, I took the drive to the imac and attempted to do a backup and the imac was unable to see the drive. I launched Disk Utility on the imac and it was able to see the drive, so I tried to verify the disk. Midway through, DU said "this disk needs to be repaired. After about 10 mins, DU said this disk cannot be repaired.

1. Change the Finder settings

I brought the disk back to the MacBook and same result-- MacBook could not see the disk even though it had just back up the entire thing 30 minutes previously. Figuring the drive was busted, I went out and bought a 1 TB seagate drive. Upon connecting it to the MacBook, it launched an internal app which installed Memeo apparently Seagates version of Time Machine. Once done, I launched Time Machine and it reformatted the entire drive.

I walked over to the imac and presto-- exactly the same thing happened as before-- it could not recognize the drive. Again I launched DU and it said the disk needed repair, and again the repair process stopped after a few minutes saying it could not repair the disk.

Why a flash drive is not showing up on Mac?

The macbook will not recognize the drive. It can see it within the Disk Utility program and from within system profiler, but it appears not to see it on the desktop. Now that I have two apparently non functioning backup drives, I would greatly appreciate any insights you guys could offer. Mac OS X Speciality level out of ten: 0. Mar 15, AM in response to Weeblerock In response to Weeblerock Someone please help - I have the latest macbook pro retina display running on I'd reformat the drive if I could only get my Mac to recognize that the darn thing exists, heh.

Any suggestions appreciated Based on how the drive was formatted on the PC there's a good chance you'll need to completely wipe and partition the drive in order to use the external HD. I suspect that the drive has been formatted using the NTSF system, but I haven't actually double checked that. What is going on? How do I get it back?

USB External Troubleshooter

Please help. I have a lovely LaCie, and I simply cannot get Timescape to recognize it. If someone calls Apple Care, can they please post the solution? I'm running osx USB ports and cables are working fine with everything else I use them with. Drives are not BUS powered. I'm even plugging the HDD in a power regulator to make sure it's getting clean, smooth power One drive was working fine.

The Time machine side disappeared, tried to repair disk and now both sides are not mounting. I was able to see them before I formatted them for use.

External Hard Drive Not Showing Up on Mac? Here's How to Fix It

After formatting them, I no longer see them. Not on the desktop, Disk Utilities or disk warrior. It's not the HDD's. I even returned them and got a new set just to make sure. Nobody has a clue on what is going on.

I have been using an external hard drive for a few months now and all of a sudden my Macbook has stopped recognizing the drive when I plug it in as I always correctly had done. It says TimeMachine is Delayed. My last back up was Oct 2, I have tried restarting my computer with the drive attached and with it not attached.

Still does not recognize it. When I say recognize I mean it does not show up on the desktop and the time machine application cannot see any attached drives. Any help is appreciated. Thank you.

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This always works to get it back again: 1. Restart Mac. Turn HDD power on. Wait several anxious seconds. May 10, AM in response to sbvet1 In response to sbvet1 Update Hi Weeblerock, Are you sure it's not being recognized in System Profiler? Because that's a whole other bag of issues. Which is most likely USB. Disk Utility, an application within the Utilities folder is something completely different.

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TV Speciality level out of ten: 0. Nov 4, PM in response to Co de Kleuver In response to Co de Kleuver "Just thought I let you know, i reformatted deleted the drive sacrificing previous backups and immediately the drive was recognised by my system and the icon appeared on the desktop. Jul 26, PM in response to Weeblerock In response to Weeblerock As owner of nearly hard drives, and used enough s of them, everyone should remember 2 points for the future.

Loading page content. And it definitely doesn't show up in System Profiler or Disk Utility. But the drive detects the connection at least and lights up , and the USB port works for other devices like my printer. User profile for user: JasonFear JasonFear. Is it a bus powered drive or does it draw power from the wall as well? Any other external HDs to test against? Reply Helpful Thread reply - more options Link to this Post.

Mac doesn't recognize external hard drive, how to fix?

Click the "Finder" icon in the Dock and look for your drive in the sidebar. Restart "Disk Utility" if you had to restart your computer to perform a repair and you still don't see your drive. Select your hard drive from the list and click the "Erase" tab. Click the "Format" drop-down menu and select the format you want to use.

Click "Erase" to format your hard drive. If you need to back up any information on the drive, first connect your drive to a computer that does recognize the drive and transfer the data to a new storage device. Press the power button on your computer and hold down "Command-S". Hold the keys down until you see white text appear on the screen. Type "reboot" at the prompt after Fsck completes checking and attempting to repair your disk.

Your Mac should now boot your hard disk. As a professional writer, she has written for Education.

Martin contributed English translations for a collection of Japanese poems by Misuzu Kaneko. She has worked as an educator in Japan, and she runs a private voice studio out of her home. She writes about education, music and travel. Skip to main content. General Troubleshooting 1. Double-click "Disk Utility. Computer Won't Boot 1. Tips Certain non-bus powered drives using a technology such as Firewire may require an external power source to supply enough power to operate the drive.