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What is a Sector?
"A sector is a section of the track on a drive platter whose size is determined by the type of formatting selected. When used as an address component, sector and location refer to the sequence number of the sector around the track. Typically, one sector stores one record of data. The number of sectors per track is dependent on the system type, the controller capabilities, and the drive encoding method and interface. A bad sector is an area on the platter that has become inaccessible or unable to hold data.

What is a Head Crash?
A head crash is damage to a read/ write head and magnetic media, usually caused by sudden contact of the heads with the disk surface. Head crash also can be caused by dust and other contamination inside the sealed hard disk assembly. These types of failures require mechanical stabilization in a sterile dust-free environment, also referred to as a clean room.