Vista - Hard Drive disappears after using search

This post is more of an observation, but if anyone knows what is happening,
please advise a fix. It has happened twice, so I would think it is
reproducible.

I have 2 SATA hard drives on my system, each one has 2 partitions. If I
open My Computer, both drives and all 4 partitions show up.

After I do a search from My Computer, for a file like "hosts", the second
drive will disappear from My Computer and Device Manager. The file was
found on both drives, so it was useable during the search.

Both drives are SATA. The first a WD 250G has 5744 installed on C: and the
second (Maxtor 200G) has WinXP on the primary partition, but is not being
used in a dual boot or RAID scenario.

Rebooting restores the drive, but scanning for hardware changes in Device
Manager does not. Using Vista drivers and I don't see any for Vista on the
Intel site.

Intel D875PBZ motherboard
P4 2.8 GHz
2 G memory

Clark