Caviar black defrag

What program do you use to defrag?

Just the windows 7 defrag in both cases

You should try using Auslogics Disk Defrag. It's free and quite popular. You can find it from Auslogic's website or download.com.

Ok I will try that. Any reason two different drives would have two different results with the same data?

Fragmentation occurs at the filesystem (logical disk) level, so the physical storage hardware does not play a role.

1% is nothing to worry about. My guess is that it's just a reporting error by the Windows defragger. It does not report or defrag larger fragments (64MB or bigger, supposedly there's no benefit from defragging these) by default which is just stupid if you ask me. It also does not defrag some system files.

Just download the free evaluation version of a good third party defrag utility and analyze with it. It will also show you the disk map. Usually no two defraggers will give the exact same analysis because each one differs in it's interpretation of what's fragmented, but the numbers should be similar.

Ok did not know that. Still seems odd to me that the same data fragments at 1% on one type of drive and not the smaller type, even with multiple installs

are there files on it that can't be moved?

To compare the pre and post-defragmentation results across the drives, your start condition has to be exactly the same i.e. exactly the same disk image should be installed for all the drives and defragged to compare.

But anyway, if you have time, check with a reliable utility to compare. It may probably give the same analysis for all the drives.

if you're unsure about the condition of the drives itself, then maybe a good idea to run diagnostics and also some HDD benches (HDtune etc which measures raw disk performance, not filesystem performance so is independent of fragmentation).