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In computing, format is a command-line utility that carries out disk formatting. It is a component of various operating systems , including 86-DOS , MS-DOS , IBM PC DOS and OS/2 , Microsoft Windows and ReactOS .
MS-DOS version 5 introduced the quick format option (Format /Q) which removes the disk's file table without deleting any of the data. The same version also introduced the UNFORMAT command to undo the effects of a quick format, restoring the file table and making all the files accessible again.
A block, a contiguous number of bytes, is the minimum unit of storage that is read from and written to a disk by a disk driver.The earliest disk drives had fixed block sizes (e.g. the IBM 350 disk storage unit (of the late 1950s) block size was 100 six-bit characters) but starting with the 1301 [8] IBM marketed subsystems that featured variable block sizes: a particular track could have blocks ...
Format unit: Prepares a storage medium for use. In a disk, a low level format will occur. Some tape drives will erase the tape in response to this command. Read: (four variants): Reads data from a device. Write: (four variants): Writes data to a device. Log sense: Returns current information from log pages.
A CMD HD series drive included its own SCSI controller to operate its hard drive mechanism, in addition to hosting a battery powered real-time clock module for the time-stamping of files. The stock operating speeds of the CMD HD-Series units were not very much faster than the stock speeds of a 1541 floppy drive, but the units were fully ...
Some of the following TRSDOS commands exist on disk as distinct program files (DIR/CMD, FORMAT/CMD, BACKUP/CMD) while all others exist as modules condensed into the library files (technically Partitioned Data Sets or PDSs) SYS6/SYS, SYS7/SYS and SYS8/SYS; these include the TRSDOS commands CAT, COPY, LIST, REMOVE, RENAME etc.
In 2008, Hard Disk Sentinel DOS version was released in different formats on bootable pen drive, CD, floppy. Usable when no operating system installed (or if the system is not bootable otherwise) to detect and display temperature, health status of IDE, SATA hard disk drives and with limited AHCI controller support.
Versatile Multilayer Disc (VMD or HD VMD) was a high-capacity red-laser optical disc technology designed by New Medium Enterprises, Inc. VMD was intended to compete with the blue-laser Blu-ray Disc and HD DVD formats and had an initial capacity of up to 30 GB per side. At a physical level, VMD is identical to DVD, but with the possibility of ...