SBS 2008 External drive files missing

We have seen a weird problem on our SBS 2008 server recently.  The server is a Dell Poweredge T310 with 16GB RAM.  There are two external Seagate 2TB drives attached via USB to the back ports.  One drive is for server backups using Windows Server Backup utility.  The other is for archived storage.

The archive drive is having a problem periodically.  A folder on the drive is set as a share for network users to browse historical information.  At times, the network users can browse the folder structure but cannot see any of the files in the folders.  The files are there and can be seen from the server console.

To fix this problem, the server is rebooted, drive is unplugged from USB then reconnected.  Note: we do not see this problem on the external backup drive.  Both drives are identical and were bought at about the same time.
Any thoughts on how to chase this down?
Thanks,
DP
DLP460Asked:
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DLP460Connect With a Mentor Author Commented:
Problem was resolved.  It appears that there is a refresh problem in Win7.  The solve was for the users to hit F5 when they don't see files in the folders.  This refreshes the view and then the files are displayed.

Quite silly but works.
Thanks for all of your input.
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noxchoGlobal Support CoordinatorCommented:
If you reboot the server and re-plug the drive - are they able to see the files?
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DLP460Author Commented:
Thanks, Noxcho,
Yes, after rebooting the server and re-plug the drive the files then become available to the network users.
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noxchoGlobal Support CoordinatorCommented:
What access settings do you have to this share for the remote users?
Also, to narrow the problem to its bottle neck try to move this share to the internal drive or another external drive and see if it behaves the same.
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DLP460Author Commented:
Users are able to access the folders and files regularly until this intermittent problem hits.  Share permissions are: Full Control; Change; Read: all are checked.  Network permissions are Full Control for the Security Group.   Security Group is assigned to the top level folder.

I cannot move the share to an internal drive due to limited space available.  I could copy the shared folder to another external drive to determine if the USB drive is bad.

What disk policy is best to use for a USB connected drive setup to be a permanent share for network use? "Optimize for quick Removal"  or  "Optimize for Performance".
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noxchoGlobal Support CoordinatorCommented:
Actually this should not affect anything I mean optimizing the disk. At the time of problem resurrection see if evemt log has any note about the problem. The answer could be one surface.
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DLP460Author Commented:
Trying longshots here.  I'll have to wait until the problem presents itself again.  I have no way to recreate the problem.  Could be a week or so before it occurs.

I am looking into other processes that might be running at the time to see if there is a conflict.
Thanks for the suggestions.
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DLP460Author Commented:
This was the best solution and fully resolved the problem.
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