bit 12 bit 11 bit 10 bit 9 bit 8 bit 7- 0

WORD 47:

bit 15 - 8 shall be set to 80h

bit 7 - 0 Maximum number of sectors that can be transferred per interrupt on READ/WRITE MULTIPLE commands.

The default value for this WORD is 8010h.

WORD 48: Reserved

WORD 49: Capabilities

bit 15-14 0=Reserved

bit 13 1=Standby timer value shall be as specified in ATA-/ ATAPI-6 specification 0=Standby timer value are vendor specific

Reserved (For advanced PIO mode support) 1=IORDY is supported.

1=IORDY function can be disabled. 1=LBA supported

1=DMA supported Reserved

The value for this WORD is 2F00h.

WORD 50: Capabilities

bit 15

0

(Fixed)

bit 14

1

(Fixed)

bit 13-1

Reserved

bit 0

1=device has a minimum Standby timer value that is device specific.

Standby timer value is set to 5 minutes or more. The value for this WORD is 4000h.

WORD 51: PIO data transfer cycle timing mode

bit 15- 8

PIO data transfer cycle timing mode

bit 7- 0

Reserved

The value returned in Bits 15-8 should fall into one of the mode 0 through mode.

Note: For backwards compatibility with BIOS written before Word 64 was defined for advanced modes, a device reports in Word 51 the highest original PIO mode (i.e. PIO mode 0, 1, or 2) it can support.

The value for this WORD is 0200h.

WORD 52: Reserved

WORD 53:

 

 

bit15- 3

Reserved

 

bit 2

1= the fields reported in word

88 is valid

bit 1

1= the fields reported in words 64～70 are valid

bit 0

1= the fields reported in words 54～58 are valid

If the number of heads and sectors exceed the drive parameter, bit 0 and related WORD 54-58 shall be cleared to 0. The default value for this WORD is 0007h.

WORD 54: Number of current cylinders defined by INITIALIZE DEVICE PARAMETERS command

WORD 55: Number of current heads defined by INITIALIZE DEVICE PARAMETERS command

WORD 56: Number of current sectors/track defined by INITIALIZE DEVICE PARAMETERS command

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