I have two hard drives. My main drive is a 15Gig MAXTOR (8 years old); the other is a 40 Gig Western Digital (5 years old). Because they're old I decided to test them. I tried using chkdsk with Windows, but I got a message saying that the test could not be completed. I don't remember the exact wording of the message. So instead I ran PowerMax for the MAXTOR and WinDLG for the Western Digital. Both drives passed. Does this mean the drives are in good condition necessarily? Can I get a better idea of the condition of the drives from reading the test results? Are there other tests I should do like a visual inspection? My computer is an 8 year old Compaq Presario 5000. What's the availability of hard drives for my computer? Also, I'd like to make the 40 Gig drive my main drive because of its larger memory. Is switching drives difficult to do? My main drive makes noise like its running something most of the time. Could this be because my configuration is small (630MHz processor, 192MB RAM), and it can't keep up with my XP o/s? I recently ran through many antivirus programs with techies on another site and deleted at least one virus I found, but the HD is still noisy. BTW, there's a warning when running the longer test with WinDLG that says data should be backed up before running the test because data could be lost or the drive could be damaged or whatever. How true is this? Sorry about the number of questions, but my understanding of computers is rudimentary. Any replies would be appreciated.