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Scratch space is space on the hard disk drive that is dedicated for storage of temporary user data, by analogy of "scratch paper." [ 1 ] [ 2 ] It is unreliable by intention and has no backup . Scratch disks may occasionally be set to erase all data at regular intervals so that the disk space is left free for future use.
The data returned gives information about the drive attached to the controller. There are three ATA commands involved in creating and using a host protected area. The commands are: IDENTIFY DEVICE; SET MAX ADDRESS; READ NATIVE MAX ADDRESS; Operating systems use the IDENTIFY DEVICE command to find out the addressable space of a hard drive.
For most disks, each sector stores a fixed amount of user-accessible data, traditionally 512 bytes for hard disk drives (HDDs), and 2048 bytes for CD-ROMs, DVD-ROMs and BD-ROMs. [1] Newer HDDs and SSDs use 4096 byte (4 KiB) sectors, which are known as the Advanced Format (AF). The sector is the minimum storage unit of a hard drive. [2]
[19] [failed verification] The capacity of a hard disk drive, as reported by an operating system to the end user, is smaller than the amount stated by the manufacturer for several reasons, e.g. the operating system using some space, use of some space for data redundancy, space use for file system structures.
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 ...
A disk drive is a device implementing such a storage mechanism. Notable types are hard disk drives (HDD), containing one or more non-removable rigid platters; the floppy disk drive (FDD) and its removable floppy disk; and various optical disc drives (ODD) and associated optical disc media.
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