Logical Block Addressing

(redirected from Enhanced BIOS)

Logical Block Addressing

(storage)
(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.
References in periodicals archive ?
Toshiba's new line of enterprise laptop PCs will combine IBM software based on its Tivoli Endpoint Manager and Toshiba's enhanced BIOS feature to allow IT managers to apply company's specific policies for energy controls and security across PCs within an organization.
and continue updating the recently released BIOS Wizard utility as well as continued development of our enhanced BIOS Upgrade technology.
Our boards include dedicated timers, extended FLASH, hardware monitoring, and enhanced BIOS features.
There are a number of important factors that could cause actual events or the company's actual results to differ materially from those indicated by such forward-looking statements the ease or difficulty of achieving development milestones and correcting software errors, market acceptance of, and demand for, the enhanced BIOS, competition, intellectual property rights, litigation, general economic conditions and other risks identified in Iomega's SEC filings.

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