Formatting a partition erases all data on the partition and allows you to start with a clean drive. Whether a partition is formatted with NTFS or converted using the convert command, NTFS is the better choice of file system. (For more information about Convert.exe, after completing Setup, click Start, click Run, type cmd, and then press ENTER. In the command window, type help convert and then press ENTER.) In order to maintain access control on files and folders and support limited accounts, you must use NTFS. If you use FAT32, all users will have access to all files on your hard drive, regardless of their account type (administrator, limited, or standard.) NTFS is the file system that works best with large disks. (The next best file system for large disks is FAT32.) There is one situation in which you might want to choose FAT or FAT32 as your file system. If it is necessary to have a computer that will sometimes run an earlier version of Windows and other times run Windows XP, you will need to have a FAT or FAT32 partition as the primary (or startup) partition on the hard disk. Most earlier versions of Windows cannot access a partition if it uses the latest version of NTFS. The two exceptions are Windows 2000 and Windows NT 4.0 with Service Pack 4 or later. Windows NT 4.0 with Service Pack 4 or later has access to partitions with the latest version of NTFS, but with some limitations: It cannot access files that have been stored using NTFS features that did not exist when Windows NT 4.0 was released. For anything other than a situation with multiple operating systems, however, the recommended file system is NTFS. Important Once you convert a drive or partition to NTFS, you cannot simply convert it back to FAT or FAT32. You will need to reformat the drive or partition which will erase all data including programs and personal files on the partition. UK / NORTHERN IRELAND HELPLINE 0871 37 61 020 (costs 7/min from a BT landline, mobile costs may be higher) REPUBLIC OF IRELAND HELPLINE 1-800-992508 The following table describes the compatibility of each file system with various operating systems. NTFS FAT FAT32 A computer running Windows Vista/XP/ Windows®7 or Win- Access is available Access is available only dows 2000 can access files on through MS-DOS, all through Windows 95 OSR2, an NTFS partition. A computer versions of Windows, Windows 98, Windows Mil- running Windows NT 4.0 with Windows NT, Windows lennium Edition, Windows Service Pack 4 or later might be 2000, Windows XP, 2000, Windows XP, Windows able to access some files. Other Windows Vista, Win-Vista and Windows®7.. operating systems allow no dows®7 and OS/2. access. The following table compares disk and file sizes possible with each file system. NTFS FAT FAT32 Recommended minimum volume size is approximately 10 megabytes (MB). Volumes much larger than 2 terabytes (TB) are possible. Cannot be used on floppy disks. File size limited only by size o...