Laptop Disk Defrag question.?

If you're using Windows Vista or later then your computer is already defragging automatically at regular intervals (default it checks fragmentation once a week), so there's literally no benefit at all to defragging it manually.

If you're using XP or some other operating system, you technically only need to defrag C, since "System" is (i'm guessing) your recovery partition and isn't used on a day to day basis (if a volume isn't being actively used then it doesn't get fragmented).

By the way if your computer is using and SSD then DON"T defrag it no matter what your OS is. Defragging an SSD doesn't provide any performance benefits and introduces a ton of unneccesary wear and tear to the drive.

I usually defrag them both at once. Gets it done a bit faster.

select all.defraging will not affect the files.

Both together!