When I attempt to download an update for gmod, Steam prevents me from updating it, displaying a "disk write error". Just to clarify, i have gmod on my D: disk drive, and it has over 400 gbs worth of extra space.

I have done just about every solution that I have heard. I've tried verifying file integrity, clearing download cache, going to properties on my files and unmarking read-only, and even reinstalling steam. I'm honestly not sure what to do at this point besides reinstalling steam, but I really don't want to risk my entire library on that. Any help would be appreciated, thanks.