Dave48838 wrote:
the drive vanishes, it doesn't show up in my computer or disk management until I reboot.
This specific behaviour does sound more like a hardware problem to me (although not necessarily with the drive itself). Does the drive always appear normally (in BIOS, Windows "Computer" and "Device Manager") immediately after a reboot - or does it ever need extra reboots before the drive is usable?
Dave48838 wrote:
I ran a mhdd test on it and it came out fine.
Which specific MHDD test do you mean? When you say "fine", what were the exact results - do you have a photo of the MHDD screen so we can see the result?
Dave48838 wrote:
what other tests could I do to determine whether or not to reuse this drive
Check the Windows event logs on that drive, to see if it contains any relevant drive or drive-controller related errors.
Then I would connect this drive as a slave to a desktop where smartmontools (Linux or Windows versions are available) has been installed (or boot the laptop from a Linux Live CD which includes smartmontools already), and run smartctl -a (or, even better, smartctl -x if it is available on that version of smartmontools) in order to try to collect all the available public details, including the drive's internal error log. Entries in that log may reveal more. There's an example of the type of output to expect, in this thread:
viewtopic.php?f=1&t=23204Redirect the text into a file on another drive (or ramdisk) and attach the file with your reply. I've written about similar testing in other threads. Here's a previous (unfortunately incomplete) thread with a slightly similar problem, which includes other suggestions:
viewtopic.php?f=1&t=24232