Sony PCG-SR5K - Manual (Page 103)

Using the System and Application Recovery CDs '
Hard Drive Partition
In order to improve the performance of your computer’s DVgate™
Motion software, the hard disk drive on your computer has been
formatted with two partitions, C and D.
* DVgate Motion saves files to the
D partition. This prevents large video captures from consuming the
available space on your C partition. To maintain optimum performance of
DVgate Motion, you should defragment your D partition regularly. See
the DVgate Motion online help for more information.
* See “Specifications” on page 92.