Get more disk space - Convert FAT32 to NTFS Filesystem

First this trick need an ntfs disk, if u have fat or fat32, the convert it here is how: open ms-dos and write

MFT and NTFS Conversion Optimizations
For best performance, it is also important that the MFT be stored in a contiguous location on disk. The new /cvtarea flag for the Windows XP version of CONVERT (described later in this article) allows system manufacturers to implement a manufacturing process that results in a properly located contiguous MFT for NTFS volumes.

The following illustration compares the location of the MFT before, during, and after conversion of a FAT32 to NTFS volume.

Convert-friendly FAT32, ensuring the NTFS MFT is contiguous

convert X:/fs:ntfs

Replace X by the drive name (c or d or e)

For example... for drive C:\ convert c:/fs:ntfs

now select a drive (c or d or e.......) right-click and propreties, then clickon general and select "compress drive to save disk space" and press ok...no data will be damaged or removed.