翻訳と辞書
Words near each other
・ logic bomb
・ logic design language
・ logic emulator
・ logic for computable functions
・ logic gate
・ logic programming
・ logic replacement technology
・ logic variable
・ logical
・ logical address
・ logical block addressing
・ logical complement
・ logical interchange format
・ logical link control
・ logical link control and adaptation protocol
・ logical relation
・ logical shift
・ logical shift left
・ logical shift right
・ logical unit


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Logical Block Addressing : FOLDOC
Logical Block Addressing
(LBA) A hard disk {sector} addressing scheme used on all SCSI hard disks, and on ATA-2 conforming IDE hard disks. The addressing conversion is performed by the hard disk firmware.
Prior to LBA, combined limitations of IBM PC BIOS and ATA restricted the useful capacity of IDE hard disks on IBM PCs and compatibles to 1024 cylinders * 63 sectors per track * 16 heads * 512 bytes per sector = 528 million bytes = 504 megabytes. Modern BIOSes select LBA mode automatically, and work around the 1024-cylinder BIOS limit by representing a hard disk to the OS as having e.g. half as many cylinders and twice as many heads. However, there is still an unbreakable BIOS disk size limit of 1024 cylinders * 63 sectors per track * 256 heads * 512 bytes per sector = 8 gigabytes, but modern OSes (including Windows 9x, Windows NT and Linux) are not affected by it, since they issue direct LBA-based calls, bypassing the BIOS hard disk se


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