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Logical Block Addressing
(redirected from Logical Block Address)

    Also found in: Wikipedia 0.03 sec.

Logical Block Addressing

See LBA.

(storage)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 services completely.


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Data Reference Tag: This field is composed of the least significant four bytes of the logical block address of the command that is associated with this block.
What is SCSI-based protection information and why should you care? by Leo, Stephen / Computer Technology Review
Finally in the chance that a PuRAM-GO(TM) and PuRAID-GO(TM) device encounters bad memory blocks as it approaches its write/erase cycle endurance limit, remapping is performed on the fly by its firmware to replace logical block address entries that point to bad memory blocks with new good blocks.
L International Announces Its Next-Generation ... by Business Wire
Size Mode Page Parameter Control Inquiry Data Diagnostic Pages Capacity Controls Indicators Activity LED Fault LED Indicators Reliability MTBF Reliability Duty Cycle Interactive Error Management Internal Data Integrity Checks Data Integrity Dual Port (1) Logical Block Address (2) Rotational Position Sensing (3) Queue = 16 (4) Input Output Error Detection Code
Serial attached SCSI or serial ATA hard disk drives: how to choose ... by Computer Technology Review
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