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Firstly, it all depends on the state of the computer and what you, as a user, require with your PC. Reformatting a hard disk is a process that wipes all of the information from the disk, leaving you with a clean drive. The type of formatting your computer performs can vary: Quick = the system re-writes the TOC (Table of Contents) on the drive to identify every sector as ready for deletion, but does not physically delete the data on the hard drive until it is over-written by a new OS installation, etc. This means that a drive can potentially be recovered even after a quick re-format. Do not use quick formatting on a drive containing sensitive information. Other types include a more thorough version of the formatting process, including rewriting all sectors with '0's from 1-3 times over. This thoroughly overwrites all data on the drive with inconsequential data. Sensitive data will have been deleted safely. The purpose of a reformat can vary. You may find your operating system has become sluggish with unwanted freeware/shareware and other programs that you can't seem to delete/uninstall and are complicating the use of your system resources. Also, you may wish to partition a hard disk (split it in to separate divisions) for the purpose of installing a different operating system or reserving space for other files. on a different file format (FAT or NTFS). Sometimes, the space you use up on the hard disk can be errant and lie in a sector that prohibits a partition from being created. In such a case defragmenting the hard drive can help, otherwise you will need to reformat and then partition the drive. Hope this helps...

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Q: When does a hard disk need reformatting?
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