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(A) Track (B) Geometrical sector (C) Track sector (D) Cluster. A disk drive track is a circular path on the surface of a disk or diskette on which information is magnetically recorded and from which recorded information is read. A track is a physical division of data in a disk drive, as used in the Cylinder-Head-Record (CCHHR) addressing mode ...
Cylinder, head, and sector of a hard drive. Cylinder-head-sector (CHS) is an early method for giving addresses to each physical block of data on a hard disk drive. It is a 3D-coordinate system made out of a vertical coordinate head, a horizontal (or radial) coordinate cylinder, and an angular coordinate sector. Head selects a circular surface ...
In computer file systems, a cluster (sometimes also called allocation unit or block) is a unit of disk space allocation for files and directories.To reduce the overhead of managing on-disk data structures, the filesystem does not allocate individual disk sectors by default, but contiguous groups of sectors, called clusters.
From RAMAC until the early 1960s most hard disk drive data were addressed in the form of a three number block addressing scheme Cylinder, Head & Sector (CHS); the cylinder number, which positioned the head access mechanism; the head number, which selected the read-write head; and the sector number, which specified the rotational position of a ...
In the LBA addressing scheme, sectors are numbered as integer indexes; when mapped to CHS (cylinder-head-sector) tuples, LBA numbering starts with the first cylinder, first head, and track's first sector. Once the track is exhausted, numbering continues to the second head, while staying inside the first cylinder. Once all heads inside the first ...
Sector offset BPB offset Field length Description 0x00B: 0x00: 13 BYTEs: DOS 2.0 BPB: 0x018: 0x0D: WORD: Physical sectors per track (identical to DOS 3.0 BPB) 0x01A: 0x0F: WORD: Number of heads (identical to DOS 3.0 BPB) 0x01C: 0x11: DWORD: Hidden sectors (incompatible with DOS 3.0 BPB) 0x020: 0x15: DWORD: Large total logical sectors
The 10 individual read/write heads are mounted on a common actuator within the disk drive which moves in and out hydraulically and is mechanically detented at the desired track before reading or writing occurs. The disks spin at 1500 rpm. Each recording surface has 100 tracks with 20 sectors per track. Each sector stores 100 characters.
4 KB sector alignment with hard disk drives supporting Advanced Format (AF) Track partition alignment, partitions starting on track boundaries on hard disk drives; Cylinder partition alignment, partitions starting on logical or physical cylinder boundaries on hard disk drives
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