Can't defrag DATA (D) drive?

There are several defraggers that can do the job without a problem
Defraggler - File and Disk Defragmentation - Free Download

If your D is the recovery partition, there is no need to defrag it. Else go with Richard's proposal.

Open it and have a look what's in there. Did that come preinstalled with the PC?

Download windirstat and send us a pic.

flycaster said:

Opened Disk Defragmenter. DATA (D) is showing 21% fragmented. However when I highlight this drive, it is only highlighted for about a second and I can't get this drive to be degragged. I can defrag the OS (C) drive, though. What's up.

Have you got a scheduled defrag set up on the drive? If not, set one up and see if it runs.

IMO, we should try helping him fix this rather than suggesting a 3rd party option.

tw33k said:

flycaster said:

Opened Disk Defragmenter. DATA (D) is showing 21% fragmented. However when I highlight this drive, it is only highlighted for about a second and I can't get this drive to be degragged. I can defrag the OS (C) drive, though. What's up.

Have you got a scheduled defrag set up on the drive? If not, set one up and see if it runs.

IMO, we should try helping him fix this rather than suggesting a 3rd party option.

I think there is no fix required if that is the recovery partition. There is absolutely no performance issue since he may never use that partition anyhow.
If, however, that is a data partition, then it is another story. That's why I was first trying to find out what's in the partition.

That's true but he still should be able to defrag it.

That is why I suggested Windirstat, the OP said he was not sure if it was the recovery partition.