I have a an RB1100AHx2 that apparently came new with an internal 64mb drive. Logged in as admin looking at the file list through Winbox I see just a few files taking up about 2mb. However, I am seeing 56.4MiB of 64.0MiB used. At first I was concerned this box may be compromised and do still have concerns with regards to that but also suspect it's just that the flash drive has maybe had several equivalent of sectors marked bad. I was looking into if there were disk utilities I am not aware of yet that show reports of bad sectors. Any other suggestions or things I can provide that might assist me with figuring out why I only have 11% free space on this particular box without just replacing it. I don't mind replacing it but if it has been compromised and that is why there is not free space I ideally need to know that.

Try installing this: https://www.mikrotik.com/download/share/fix_space.npk

Thank you. I must have missed that in the release notes. I'll give it a shot when I get a chance.