ATAPI InterfaceChapter 5

Read Position command

Bit

7

6

5

4

 

3

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

Operation code (34h)

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

2

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

9

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

The following table describes the Read Position layout.

Byte

Description

Value

Meaning

 

 

 

 

0

BOP, EOP, BPU

nn

80h = Beginning of Partition

 

 

 

40h = End of Partition

 

 

 

04h = Block Position Unknown

 

 

 

 

1

Partition Number

00/01h

Current Partition (bit 0)

 

 

 

 

2,3

Reserved

00h

-

 

 

 

 

4-8

First Block Location

NNNNNNNN

Logical Number of next block to transfer

 

(Host Block Location)

 

between host and buffer

 

 

 

 

 

 

 

8-11

Last Block Location

NNNNNNNN*

Not Supported

 

(Medium Block

 

 

 

Location)

 

 

 

 

 

 

12

Reserved

00h

 

 

 

 

13-15

Blocks in Buffer

000000*

Not Supported

 

 

 

 

16-19

Bytes in Buffer

00000000*

Not Supported

 

 

 

 

STT8000A Product Manual

Page 53

Page 61
Image 61
Seagate STT8000A manual Read Position command, Following table describes the Read Position layout