lba

2 definitions found

lba - Free On-line Dictionary of Computing (26 May 2007) :

  Logical Block Addressing
  LBA
  
     <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.
  
     (2000-04-30)
  

lba - V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006) :

  LBA
         Logical Block Addressing (EIDE)