I did a chkdisk on my HD and I disabled my antivirus for the scan, and I was sure that there would be no prob. I did a scan, redownloaded the sets, then I cleared the cache, reloaded the dat, and scanned again. It reported totally different sets this time with 'wrong sha1'

???
here's an example of what type of thing comes up a lot:

2020 Super Baseball (set 1) [system: Neo-Geo - folder: 2020bb - size: 8mb]
wrong sha1: 030-c2.bin [wrong: 1f43363e52d2e07b669bf6d01f01c149ee10478f] [right: 0920cc580d7997fcb0170dd619af2f305d635577]

what's also wierd is mostly neo geo games have this unique issue.

I tell ya I do a scan and it seems like different sets come up as full archive integrity check reported errors or wrong SHA-1
I guess my memory is bad? does using an external usb 2.0 HD make a difference?