Why external hard disk drives are preformatted
Many of these external hard drives come preformatted from the factory for quick use. This spares the user the trouble of having to go through the Disk Management console, mount the volume, format it and assign it a drive letter.
Unfortunately, many of these drives are preformatted as FAT32 volumes. This is quite deliberate, as there are still a few computers out there running earlier versions of Windows that cannot see or deal with NT file system partitions.
Sometimes this problem doesn't manifest itself immediately. For instance, if you connect the external hard disk drive and use a backup product (such as Windows's own NTBACKUP) that writes the backup as one contiguous file, the backup may inexplicably fail after the backup program writes 4 GB. The reason is simple: The FAT32 file system cannot support single files larger than 4 GB. It can support large volume sizes, but no one file can be larger
Updating preformatted external hard disk drives
The solution is simple enough. The first time you connect such a drive, determine what file system it is through the external drive's Properties page. If it's FAT32, reformat it as NTFS. The only exception to this would be if you're connecting to a non-NTFS-compatible system, of course.
About the Author:
Serdar Yegulalp is editor of the Windows Insight, (formerly the Windows Power Users Newsletter), a blog site devoted to hints, tips, tricks and news for users and administrators of Windows NT, Windows 2000, Windows XP, Windows Server 2003 and Vista. He has more than 12 years of Windows experience under his belt, and contributes regularly to SearchWinComputing.com and SearchSQLServer.com.
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This was first published in June 2005