The main advantage that ATA-2 brought with it was the introduction of LBA (Logical Block Addressing) addressing, this was a major improvement to the CHS addressing system used in ATA-1, the LBA system gave unique identifiers to blocks of data on the drive, each identifier is 28 bits long, which gives up to 137GB of possible storage.ĭata Transfer Rates: 11.1MBps and 16.7MBps. The ATA-1 standard (referred to as simply ATA) was the original ATA interface used in the old IBM AT computers, ATA-1 allowed for 2 hard drives to be connected in the (now familiar) Master and Slave configuration, it also specified DMA and PIO support.ĪTA-1 used what is known as CHS (Cylinder, Head, Sector) addressing, whereby a block of data would be identified by its cylinder, head and sector parameters, at the time, this (along with some BIOS issues) limited the size of the hard drives to 528MB.ĭMA (single word) modes 0, 1 & 2 - DMA (multiword) mode 0.ĭata Transfer Rates: 3.3MBps and 8.3MBps. ATA-1 (standard withdrawn in August 1999)
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