NTFS isn't a single bit better than HFS+ in terms of checksums.
Also, HFS wasn't used on the original Macintosh 128K -- that used a simpler filesystem called MFS. HFS was introduced with the Mac Plus a couple of years later.
Also, HFS wasn't used on the original Macintosh 128K -- that used a simpler filesystem called MFS. HFS was introduced with the Mac Plus a couple of years later.
Have you checksummed your files lately?