Why does my iMac no longer recognize my external disk device after upgrading to Snow Leopard?

I've used an external hard drive for my Time Machine back-up for a few years. After I upgraded to Snow Leopard recently, the Time Machine delayed. When I tried to select a disk, my external drive no longer appears (it says "None"). The USB and power are all plugged in.

Thanks for replying. No, it doesn't show up anywhere anymore.

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I have a big problem with Lion and PGP. After upgrading from snow leopard to lion I cannot access my PGP drive which was generated under snow leopard. PGP does not start but gives a notion that lion cannot work with my PGP version. Solution?

After upgrading from Snow Leopard to Lion I cannot access a PGP drive which was generated under snow leopard. PGP does not start. When I try to start I just receive a message that Lion cannot work with PGP. How can I now access important and confifential informatio which I have stored in PGP (snow leopard). Do I have to move back to snow leopard. If so, how can I do this?

If you have this product,
http://www.symantec.com/business/support/index?page=content&id=TECH165159
you have to go back to Snow Leopard.
To re-install SL, back up your home directory, format and re-install.

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--Frank Strallents
www.SHOCKPROOFX.com

I'll try your suggestions....Thanks!
Recently, I try to Re-install Snow Leopard, unfortunately, still unsuccessful.
The Mybook Icon only appears if it is connected via USB.
After using Firewire and getting used to the speed...USB 2.0 is like a Corvette racing a Veyron...lol
I am not upset on these issues, it is normal for new OS to have these problems...unfortunately, even OSX is not invincible.
I'm sure Apple/Steve is on every Programers A*s for a solution.
I still think APPLE'S OSX will still be the future of Operating system!
For now, still waiting for the patch and hopefully soon.
Suggestions are still Welcome for a Solutions:-)
Frank
SHOCKPROOFX.COM

I'd love some help trying to figure out why my 2008 MacBook no longer recognizes my external drive and now is not downloading photos from my iphone....?

After many years of having no problems at all on my Macbook, I recently figured I should finally upgrade my OS. I did that about three weeks ago, updating to Snow Leopard (10.6.8). I used Time Machine at least once after the OS upgrade but now Time Machine no longer recognizes the external drive I have used for all these years to back up. The MacBook does not "see" it. (Disk Utility does however.) The computer then also stopped recognizing another La Cie back-up that I have and now... my iPhone cannot download photos? Yikes.
I have, of course, shut down numerous times, used different cables (that worked for some) and the two USB drives. I even used a firewire. Nothing worked. I also tried to "Repair disk" on Disk Utility. It didn't work either, giving me an error (that I didn't save, sorry).
I read many other discussions on the file format of the external drive and of course I'd be happy to reformat the external drives--however, it is obviously a tad nerve-wracking to reformat drives before having an accessible back-up. Suggestions? I do not remember what file format they have but am pretty sure it's not the Mac file system someone mentioned. The drives are a 2009 WD "My Passport Elite" and La Cie 2007 d2 Quadra,
In terms of other hardware available, we do have another MacBook Air but it has started rejecting both drives as well (without the Snow Leopard upgrade). We have an old Dell but it wouldn't have the disk space to help out much.
Any thoughts on the process involved would be welcome. Any ideas on the iPhone rejection would be helpful as well! It is a 30gig iPhone 4 that has 20 or so gigs free (not clear as iTunes says that there are abour 18 Gigs on the phone but 24 free gigs? I may be bad at math but that's 40 gigs...).
I am checking out iCloud but apparently there are only 55 gigs available?
Will be glad to hear any thoughts. Thanks!

Good afternoon Lyssa,
Phew. First of all, thanks in advance...these blogs are always comforting help!
So, to answer your questions: For the age of the hard drive.Well, I added memory a couple of years ago (RAM and hard drive). Being a mom leads me to eat up a fair amount of gigs with photos of my kids and, in fact, I think I entirely replaced the original drive, so it is a couple years younger than 2008 since I did that in March 2010. If there is some way to verify that (whether or not I replaced the entire drive), I'm all ears. I have 311 Gigs free, so it is not a space issue. I verified the startup disk on Disk Utilityand nothing showed up.
Question 1- What formats...
The La Cie is format Windows NT Filesystem 3G ....At the time that I bought it I was still using a PC as well as a Mac and was told by afriend to use this format...
The WD is Mac OS Extended (Journaled). I again tried to repair the WD last night and this is the error message: "Error: DiskUtility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files."
Also, Time Machine tried again to back-up and gave me this error: "Files can't becopied onto the backup disk because it appears to be 'read only'. You may needto repair or reformat the disk using Disk Utility. If the disk can't berepaired, you must use a different disk for backups. Open Time Machinepreferences to select a different backup disk."
Question 2. Other cables...
I used two other cables with the WD and that didn't change anything.
Question 3... Fire Wire from the La Cie
Yes, I used the Firewire cable from the La Cie and it is indeed present, though still not visible in Finder. Since it is not Mac OSExtended I know that I can't use Time Machine with it.
So, in summary...
I can plug in the La Cie and it is functional on the MacBook, visible on Disk Utility but not visible in Finder. The WD drive is not visible and not functional. So we can think it is indeed the WD that is not working.... Also, the iphone photos did, in the end, get downloaded, so it is not something more general.
Causes...
I forgot to mention that there is a "lost+found" file on the WD which apparently points to a UNIX /OS issue?
Some kind of "insurance"?....
I'm curious about how people avoid this kind of issue. You just regularly replace back-up drives and hard drives before problems come up? Time Machine is great and saves many of us from disasters, however, knowing that your Time Machine back-ups are vulnerable makes the whole system insecure. No way to have alarms ring before the drive goes out?
As for ways ahead...
It seems that I ought to be able to copy off of the WD to the MacBook then erase it and reformat it and start over again. However, I haven’t been able to see its contents except on random occasions. If you have any ideas on how to copy the Time Machineback-ups from the WD, again, I'm all ears!
Good afternoon Lyssa,
Phew. First of all, thanks in advance...
So, to answer your questions:
For the age of the hard drive. Well, I added memory a coupleof years ago (RAM and hard drive). Being a mom leads me to eat up a fair amountof gigs with photos of my kids ….and, in fact, I think I entirely replaced theoriginal drive, so it is a couple years younger than 2008 since I did that inMarch 2010. If there is some way to verify that, I'm all ears. I have 311 Gigfree, so it is not a space issue. I verified the startup disk on Disk Utilityand nothing showed up.
Question 1- What formats...
The La Cie is format Windows NT Filesystem 3G ....At thetime that I bought it I was still using a PC as well as a Mac and was told by afriend to use this format...
The WD is Mac OS Extended (Journaled). I again tried torepair the WD last night and this is the error message: "Error: DiskUtility can’t repair this disk. Back up as many of your files as possible,reformat the disk, and restore your backed-up files."
Also, Time Machine tried again to back-up and gave me thiserror: "Files can't be copied onto the backup disk because it appearsto be 'read only'. You may need to repair or reformat the disk using DiskUtility. If the disk can't be repaired, you must use a different disk forbackups. Open Time Machine preferences to select a different backup disk."
Question 2. Other cables...
I used two other cables with the WD and that didn't changeanything.
Question 3... Fire Wire from the La Cie
Yes, I used the Firewire cable from the La Cie and it isindeed accessible, though still not visible in Finder. Since it is not Mac OSExtended I know that I can't use Time Machine with it.
FYI...
So, in summary... I can plug in the La Cie and it is “functional” on theMacBook but not visible in Finder. The WD drive is not visible and notfunctional. So we can think it is indeed the WD that is not working.... ALSO,the iphone photos did, in the end get downloaded.
As for ways ahead…
It seems that I ought to be able to copy off of the WD tothe MacBook then erase it and reformat it and start over again. However, Ihaven’t been able to “see” its contents except on random occasions…
Any further thoughts are welcome!

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Hello Brad:
First, forget about a virus. There are NO documented viruses that affect a Mac running OS X - none.
Do you have about 10-15% of the HD free at all times?
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Thanks. Now I could back it up. It even booted. But now I have a new problem. The new hard drive is reallz faster than the old one. But Evers now and then the system just freezes. Not like when it was overworked before with the old system. No it completely freezes. You can just move the mouse then. But you can move windows, can't click on anything. This lasts about 30 seconds, then everything is normal. Is there a size maximum for a internal hard drive or cache max or a speed max. It makes go crazy.
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Also, seriously, I would get some tape, like duct tape, and tape up that loose power supply.
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Greetings,
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From what you describe, it sounds like you (or someone else) may have moved Safari from where it belongs, and therefore it wasn't updated when you installed Snow Leopard, which would cause the current version it sees to not run.
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Hello,
my MacBook Pro (late 2008 unibody) just needs a main logicboard replacement, fortunatly still within warrenty, after updating to 10.6.0. I experienced the following: With an update from 10.5.6 to 10.5.7 the MBP freezed within 10min. after reboot, with every restart it freezed after a shorter period and finally freezed during the boot process. I've mounted the MBP as an external HD to my iMac, did an backup and deleted the internal MBP harddrive by overwriting it with zeros. I did the usual procedure of resetting SMC, P/V-RAM and reinstalled 10.5.6 - everything was fine again!
When Snow Leopard came out, I updated again, hoping the issue has been repaired. BUT I experienced the same problems and with some system permission deleting I got SL running as long as I did not turn on AirPort. As soon airport is activated and an internet connection is established I could count the seconds until the mac freezes. And it will only come up again by deleting the system configuration preferences (via single user mode booting).
Thereafter I was sure there is a hardware problem with the airport card or the logic board. The Apple Service Provider did not find any hardware failure and finally will change the logic board. Hopefully I got the Mac back next Tuesday. I let you know about the results.
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PS: Obviously software could damage hardware or some hardware components used by Apple are not compatible with some of their software.

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Try here:
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Right now I'm searching on Google the error described above. Also, I don't know whether this subject is directly linked to the main problem of my concern: the installation of new programs. If anyone has any hints or tips, let me know.
My very thanks in advance.

Why does my iMac no longer recognize my external disk device after upgrading to Snow Leopard?

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