I've read a couple unresolved threads on this and have gotten no where, so here goes:
I installed a secondary IDE drive (160gb) and everything works swell. However, when the computer sleeps or hibernates and I wake it up, that second drive has disappeared, both from My Computer and Device Manager. I can rescan with Device Manager and find it again, but this isn't a practical solution. The drivers are all up to date.
This computer is a headless FTP server, and won't get enough use to justify letting it run all the time. I can wake it up via the network card to access it, however, the drive that I store stuff on is that second drive, and if it disappears, I obviously can't access the data on it remotely.
HP D530 sff P4 2.53 Ghz 768 MB Ram 40 GB main drive, 160 GB secondary XP Pro
More aboutsecondary disappears sleep hibernate
Try updating the bios.
possibly the drive is going bad, do you have any other drives laying around you could try?