Search results
Results from the WOW.Com Content Network
(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.
In logical block addressing, only one number is used to address data, and each linear base address describes a single block. The LBA scheme replaces earlier schemes which exposed the physical details of the storage device to the software of the operating system. Chief among these was the cylinder-head-sector (CHS) scheme, where blocks were addressed by means
Disks varied sectors / track and disk speed to keep consistent bit density across tracks [26] Double 2 512 1,196 kB [27] Tandy TRS-80 5 1 ⁄ 4 inch Single 1 35 10 256 soft 88 kB 300 FM Model 1/3/4 5 1 ⁄ 4 inch Double 1 40 18 256 180 kB MFM Model 1/3/4P 5 1 ⁄ 4 inch Double 2 40 18 256 360 kB MFM Model 4D 8 inch Double 1 77 26 256 500 kB MFM ...
Within the disk drive, this linear block number was translated into a cylinder number, head number and sector number. Moving the translation into the disk drive allowed drive manufacturers to place a different number of blocks on each track transparently to the accessing software.
Physical layout of sectors in a zone-bit disc: As distance from the centre increases, the number of sectors in a given angle increases from one (red) to two (green) to four (grey). The inner tracks are packed as densely as the particular drive's technology allows. The packing of the rest of the disks is changed depending on the type of disk.
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