Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I was bored and decided to open up my hard drive in HxD (a free hex editor) and wanted to see what the REAL size of my disk is. So I did and scrolled to the bottom and discovered that the last sector is unused and unwritten to. Why would this be?


(Also it says it isn't the last sector, but it is)

share|improve this question
How did you established it was unused? – David Schwartz Sep 8 '12 at 4:14
I've had this disk for 6 years and it's still empty. Also, it looks like this on my other drives – Cole Johnson Sep 8 '12 at 4:21
It's for the 6800 hcf – Snesticle Sep 8 '12 at 4:24
up vote 1 down vote accepted

The last sector would be unused if 1) it was not included in any partition, or 2) if it is inside a partition, but the partition does not carry a filesystem, or 3) if it is in a filesystem, it has not been allocated to any file, or 4)if it has been assigned to a file, the file does not have anything to put in there. You give absolutely no information to decide the state of the sector you show. There is no reason to think that sector is unused, the fact that it is all nulls indicates nothing.

share|improve this answer
Files are 4k at the minimum on the disk, so could it be that? – Cole Johnson Sep 8 '12 at 4:29

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.