Consumer HDDs get bit flips all the time. I have plenty of backup files over 100 GB. Put the file on the drive, compute the MD5SUM of it, check the MD5SUM, and

Consumer HDDs get bit flips all the time. I have plenty of backup files over 100 GB. Put the file on the drive, compute the MD5SUM of it, check the MD5SUM, and come back to check again in 6 months. On many magnetic HDDs, you will get a different value and no SMART errors.