Command: Identify drive ($EC)¢¢Transfers the 512 bytes of data, that¢specify the drive's parameters. The¢fields are as follows (F = fixed value,¢V = variable, R = reserved, should be¢zero):¢¢ 0 - vendor specific information, bits¢ are as follows:¢ 15 - 0, reserved for non-magnetic¢ devices (F)¢ 14 - vendor specific (F)¢ 13 - vendor specific (F)¢ 12 - vendor specific (F)¢ 11 - vendor specific (F)¢ 10 - vendor specific (F)¢ 9 - vendor specific (F)¢ 8 - vendor specific (F)¢ 7 - removable media device,¢ if 1 (F)¢ 6 - removable controller and/or¢ device, if 1 (F)¢ 5 - vendor specific (F)¢ 4 - vendor specific (F)¢ 3 - vendor specific (F)¢ 2 - vendor specific (F)¢ 1 - vendor specific (F)¢ 0 - reserved (R)¢ 2 - number of cylinders (F)¢ 4 - reserved (R)¢ 6 - number of heads (F)¢ 8 - vendor specific¢ 10 - vendor specific¢ 12 - number of sectors per track (F)¢ 14 - vendor specific¢ 16 - vendor specific¢ 18 - vendor specific¢ 20-39 - serial number,¢ ASCII characters (F)¢ 40 - vendor specific¢ 42 - vendor specific¢ 44 - number of ECC bytes transferred on¢ LONG operations (F)¢ 46-53 - firmware revision,¢ ASCII characters (F)¢ 54-93 - controller model number,¢ ASCII characters (F)¢ 94 - numbers of sectors/interrupt R/W¢ multiples, bits:¢ 15-8 - vendor specific¢ 7-0 - 00 = READ/WRITE MULTIPLE¢ not implemented (F)¢ 01-FF = maximum number of sectors¢ that can be transferred¢ per interrupt on¢ READ/WRITE MULTIPLE¢ commands (F).¢ 96 - reserved (R)¢ 98 - capabilities, bits:¢ 15 - reserved (R)¢ 14 - reserved (R)¢ 13 - 1 = standard standby timer¢ values are supported¢ 0 = standby timer values are¢ vendor specific (F)¢ 12 - reserved (R)¢ 11 - 1 = IORDY supported (F)¢ 0 = IORDY may be supported¢ (F)¢ 10 - 1 = IORDY can be disabled (F)¢ 9 - 1 = LBA supported (F)¢ 8 - 1 = DMA supported (F)¢ 7-0 - vendor specific (F)¢100 - reserved (R)¢102 - PIO data transfer cycle timing (F)¢104 - DMA data transfer cycle timing (F)¢106-511 - reserved¢¢All values are in standard low/high¢convention. Some parameters are defined¢as a string of ASCII characters. For the¢string "Copyright", the character "C" is¢the first byte, "o" is the second byte¢etc. When such fields are transferred,¢the order of transmission is:¢- the 1st character ("C") is on bits 15¢ through 8 of the 1st word¢- the 2nd character ("o") is on bits 7¢ through 0 of the 1st word¢- the 3rd character ("p") is on bits 15¢ through 8 of the 2nd word¢- the 4th character ("y") is on bits 7¢ through 0 of the 2nd word¢ etc.¢
