D: Drive disappears! Help

[puternut]

I have a HP desktop with 2 internal HDs (C & D). C is the system disc and D is the storage. In addition I have some external HDs connected via a USB hub. These are the ultimate destination for my files but all copying/downloading goes via D drive

My problem is that after a while of running the D Drive disappears! No warning - no reason obvious to me!!

When I "Start / My Computer" all drives are there except D

Seems the only way to get it back is to reboot. Any suggestions from ABers appreciated

Thanks

[ChuckFickens]

try setting the switch off hard drives option in the power saving setting to never as a temp fix.

for a proper fix I'd consider updating the computers bios and the hard drives firmware to the latest versions first.