| Publisher | Hitachi | ||
|---|---|---|---|
| Format | 175.6KB PDF | Date added | 01 Jan 2005 |
| Topics | |||
| Downloads | 259 | ||
Today's IDE/ATA interface hard disk drives support both Direct Memory Access (or DMA) and PIO mode (or Programmed I/O) bus mastering protocols. DMA is a generic term referring to the direct transfer of data from a peripheral device to or from a memory location on the host system. In general, DMA is a high speed data transfer to or from the hard disk that allows the host to move the data directly to and from memory with very few state changes. By default, all IDE/ATA devices support PIO mode 0. This is the basic mode of registers and commands.
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