What is Formatting?
Formatting is of two types—low-level and high-level. Low-level formatting creates the tracks and sectors that are used to store data. High-level formatting involves preparing the filesystem and creating a record of avoidable bad sectors in the partitions. All present hard disks are low-level-formatted by the manufacturer, and the user only performs a high-level format. A highlevel format can be performed in two ways: a Quick Format, which erases the existing file index and creates the desired file system, and a Thorough Format, which in addition also performs a bad sector scan.