SBS 2008 USB drives not appearing in Disk Management so backup fails

Hi Guys

I work for a company who supports many clients with quite a few now having a SBS 2008 server.  All of them have a very simliar setup, we are using the built in Backup utility and USB Hard Drives.  Most of the clients have 5 usb backup drives that are changed daily monday to friday.  

We are having a intermittent problem with a number of clients when drives are changed and the backup that night fails saying it cannot find the destination, We then check My Computer and the drive does not show up (which it shouldnt), have a look in disk management and the drive does not show up, however it does show up in Device Manager.   The light is on the drive to show its powered and ive tried unplugging and plugging back in several times with no change i tried plugging in another drive and that shows fine in disk management, plug the other one back in and again not showing up in disk management, if i reboot the server it then appears in disk management and the backup works fine.  It will then start randomly happening again sometimes with the same drive sometimes with another drive.  As i stated before this is happening with a number of clients who all use USB Hard drives however they are using different makes and sizes of drives.  The backups will work fine for a time then suddenly this issue will start happening , reboot the server and its fine for a bit then it starts happening again sometimes after a week sometimes months, i have trailed through lots fo different forums trying to find a solution without much luck, this is a particular article i have recently looked at and again after the server is rebooted it was working fine however the problem comes back again.
http://www.experts-exchange.com/Storage/Backup_Restore/Q_26791045.html

This must be a problem others have come across as we are getting it with quite a few clients, it cant be a drive issue as its happening with lots of different drives and they are fine once the server is rebooted, its not down to a particular make or model of drive as different clients are using different drives.

If you need any more detail let me know.

Thanks
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systemagicAsked:
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systemagicConnect With a Mentor Author Commented:
Eventually we found that only certain drives seemed to be compatible with SBS 2008, we found a list of drives that people have tested on sbs 2008 with details of whether they worked or not
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JamesSenior Cloud Infrastructure EngineerCommented:
It might be a driver issue. Depending on the make an model of the USB drives I would try installing a manufacturers driver for the drives.
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systemagicAuthor Commented:
I will give that a try on one of the clients to see if that makes a difference, different clients are using different drives some LG, Iomega, Buffalo etc.  
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sparky2156Commented:
Having exactly the same problem as you are systemagic.

Been working on this for days, tried everything and crawled google endlessly. Have you come across a solution yet? I have just opened a case with microsoft and am waiitng ot hear back.

I suspect this is a patch issue, and related to one of the following patches:

KB968930
KB2393802
KB2479628
KB2483185
KB2482017
KB2485376

Any luck ?
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systemagicAuthor Commented:
hey, we have not yet found a solution, the backup will work fine for a few weeks then randomly a drive will not show up correctly and backup will fail.  Then the next week that drive will show up and work fine.  Let me know if you get anywhere with Microsoft

Cheers :)
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systemagicAuthor Commented:
Hi Sparky,

Did you ever get anywhere with this?

Thanks
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systemagicAuthor Commented:
Found it was a common fault and only certain drives are compatible with the OS
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