Windows 7 prefers hard disk drives that are formatted with the NTFS file system: Its integrated backup program cannot back up files from or to drives that use the older FAT32 file system. So, if you select a drive that uses FAT32 as the backup location, Windows 7 will give an error message. FAT32, a leftover from the days of Windows 98/Windows ME, works with both MacOS and Windows (which is why many external hard disks use this file system by default), but it really lacks the features needed to fully support Windows 7 backup.
We can use Convert.exe to solve this problem. Open a command-prompt session and use the following command to change your external hard disk's file system to NTFS:
convert x: /fs:ntfs (replace x with the actual drive letter of your external hard disk).
Then press Enter
Convert.exe will check your external hard disk for errors, verify there's enough space for conversion, and then convert to NTFS.
While this theoretically will not destroy your data, we recommend you back up your files first.
After the process completes you can use your drive as normal and it will work just like your system drive.
To see and use its options just type at the command prompt:
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