|You said in your other Topic:|
"My Vista has a 9.9 GB D recovery drive as the default drive, my C drive has 268GB free,"
All drives in the operating system - Vista in this case - are logical drives, but the word logical is usually omitted.
You have a brand name system that has at least two hard drive partitions, the largest one has been assigned the C drive letter and that's where Windows itself is running from, another small hard drive partition has been assigned the D drive letter, on the original brand name system supplied physical hard drive software installation.
The small hard drive partition, D, is labelled the Recovery partition because it has sufficient data on it such that it can be used to re-install all the software that was originally on the largest partition, the C drive, when you bought the computer
You don't alter or add to the data on the Recovery partition at all if you want to be able to do that.
The D partition - drive - has a little more than enough free space such that it won't trigger Vista to display a Low Disk Space warning for the D drive.