Internal HD has difficulty mounting

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Internal HD has difficulty mounting

iMac, 17", Intel 2 GHz Core 2 Duo

Internal hard drive sometimes has difficulty mounting. I can hear it start to spin up, click 2-3 times, then spin back down, repeat. This happens during a cold start (following shutdown), but not for a restart. It also happens when "un-sleeping" if I set Energy Saver prefs to put computer to sleep. If "put computer to sleep" is set to Never, no problem.

If I'm having problems, I can usually get the internal drive to mount by booting from the DVD drive using the OS X install disk or Prosoft Drive Genius 2 disk. Disk Utility and Drive Genius 2 tests detect no problems. (tho after a failure to mount, there are usually some Disk Utility repairs needed)

So is the internal drive on its last legs, or could this be something else, such as a power supply problem?

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mayer @mayer

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Nothing you said would indicate a power supply problem. The hard drive does sound like it's terminal.

If you're not comfortable installing a internal hard drive, another option would be to go with an external. I would recommend a Firewire external drive. [produit lié absent ou désactivé : IF107-055] Here are some drives to put in it: http://www.ifixit.com/Mac-Parts/iMac-Int...

Use SuperDuper, http://www.shirt-pocket.com/SuperDuper/S... (the free version for your needs). Use this to duplicate your existing drive. Then go to system preferences - startup disk, and select the new external.

Your other option of course is to replace the internal drive. Here's how that's done: Remplacement du disque dur d'un iMac Intel 17"

You can use an adapter: Remplacement du disque dur d'un iMac Intel 17" to plug the new hard drive into to duplicate your data.

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I'd still check the SATA cable though.

10 févr. 2010 par rab777hp

Thanks for the feedback on the power supply. That was mostly just uninformed speculation on my part, since the HD kinda sounds like it's trying to start up but just doesn't quite get there.

I've looked at the excellent instructions here for opening my iMac to get to the hard drive and it definitely looks doable. And I've got good back-ups... now. I must say I was quite relieved when I was able to get the disk to mount after the first time it failed to do so - my backups were pretty slim.

BTW, thanks everyone for all your quick responses!

Thanks for the feedback on the power supply. That was mostly just uninformed speculation on my part, since the HD kinda sounds like it's trying to start up but just doesn't quite get there.

I've looked at the excellent instructions here for opening my iMac to get to the hard drive and it definitely looks doable. And I've got good back-ups... now. I must say I was quite relieved when I was able to get the disk to mount after the first time it failed to do so - my backups were pretty slim. — Mark

matthewfrey @matthewfrey Rep: 2,3k Frey Technology 16 4 1 · Answer 1 · 2010-02-10T16:00:36-07:00

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matthewfrey @matthewfrey

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as inexpensive as harddrives are - I would just replace it.. its not worth dealing with a drive thats gonna throw fits like that.. Run smart utility if you would like to verify your drive damage.

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That's not at all in the spirit of repair and longevity, there are many options before immediately replacing the drive.

10 févr. 2010 par rab777hp

thats funny, because this was voted up before you voted it down.. Longevity of harddrives? thats funny

10 févr. 2010 par matthewfrey

Actually someone voted it up afterwards, now, I'm not here to create any fights. And longevity of devices, and yes HDs, if you treat them right, they'll last a !^!& site longer than just doing whatever. Replacing without first trying other things, is jumping over the whole conservation issue, the mission statement of iFixit.

10 févr. 2010 par rab777hp

Thanks for the link to SMART Utility. Just the sort of thing I was looking for. I'm fiddling with it now, but so far SMART seems to think the drive is perfectly healthy.

I'll probably try a new HD. They are inexpensive, and it never hurts to have more storage. If it doesn't solve the problem, I can always get an enclosure for the old one. Tho if it turns out professional repair is needed, I was hoping to avoid unneeded expenses.

rab777hp @rab777hp Rep: 20,3k 68 33 18 · Answer 2 · 2010-02-10T16:03:27-07:00

rab777hp @rab777hp

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If you have another drive that's the same size, then you should try swapping out the drives, if the problems persist, then you know it's not the drive. If they disappear, then you know it was something to do with the drive.

Other things it could be besides the drive would be a loose SATA cable, that could cause those problems.

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Thanks for the suggestion - I'll give the cable a look if/when I get inside.

My iMac has had a very sedate life sitting securely on my desk, so I'd be a bit surprised if the cable came loose. Tho I suppose internal vibration or thermal stresses might have compromised it. Occasionally, a cooling fan in my iMac would kick into high gear. Not very often, but kind of unnerving whenever it did so - it's usually quite quiet.