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File size is a measure of how much data a computer file contains or how much storage space it is allocated. Typically, file size is expressed in units based on byte . A large value is often expressed with a metric prefix (as in megabyte and gigabyte ) or a binary prefix (as in mebibyte and gibibyte ).
Disk Operating System GEC: 1973 Core Operating System CP/M file system: Digital Research (Gary Kildall) 1974 CP/M [1] [2] ODS-1: DEC: 1975 RSX-11: GEC DOS filing system extended GEC: 1977 OS4000: FAT (8-bit) Microsoft (Marc McDonald) for NCR: 1977 Microsoft Standalone Disk BASIC-80 (later Microsoft Standalone Disk BASIC-86) DOS 3.x: Apple: 1978 ...
Storing small files on a filesystem with large clusters will therefore waste disk space; such wasted disk space is called slack space. For cluster sizes which are small versus the average file size, the wasted space per file will be statistically about half of the cluster size; for large cluster sizes, the wasted space will become greater.
Hard drive: partition size max Native support: File systems Native support: floppy capacities 3.5" Native support: floppy capacities 5.25" Native support: floppy capacities 8.0" Integrated disk compression utility Native support: long file names 86-DOS 0.42-1.00 — FAT12; (CP/M 2 through RDCPM) — NorthStar 87.5 KB; Cromemco 90 KB
Blu-ray Disc has a higher maximum disc capacity than HD DVD (50 GB vs. 30 GB for a double layered disc). In September 2007 the DVD Forum approved a preliminary specification for the triple-layer 51 GB HD DVD (ROM only) disc though Toshiba never stated whether it was compatible with existing HD DVD players.
The limit on partition size was dictated by the 8-bit signed count of sectors per cluster, which originally had a maximum power-of-two value of 64. With the standard hard disk sector size of 512 bytes, this gives a maximum of 32 KB cluster size, thereby fixing the "definitive" limit for the FAT16 partition size at 2 GB for sector size 512.