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Chapter 5 ATAPI Interface
Page 54 Seagate Travan 40 Product Manual
Page Code 10h—Device Configuration Parameters
Data Bits
Byte 7 6 5 4 3 2 1 0 Hex
0 0 0 Page Code (10h) 10
1 Additional Page Length 0E
2 0 CAP CAF Active Format X0
3 Active Partition XX
4 Write Buffer Full Ratio XX
5 Read Buffer Empty Ratio XX
6
7
MSB
Write Delay Time
LSB
00
00
8 DBR BIS RSMK
AVC SOCF RBO REW XX
9 Gap Size 00
0A EOD Defined EEG SEW 0 0 0 XX
0B
0C
0D
MSB
Buffer Size At Early Warning
LSB
00
00
00
0E 0 0 0 0 0 0 0 0 00
0F 0 0 0 0 0 0 0 0 00
Additional Page Length: Set to 0Eh to specify the length of the Device
Configuration page.
CAP: Change Active Partition bit, set to 1, will set the logical partition to the one
specified by the active partition field. This is only allowed if the FDP bit in the Media
Partition Page (MODE SELECT/Sense Page 11h) has been set to 1. A CAP bit set to
0 indicates no partition change is specified. The default value is 0. This value is
changeable by the Host.
CAF: The Change Active Format field shall always be set to 0, which specifies no
change to format. The Density Code in the Block Descriptor is used to specify the
format.
Active Format: The field specifies the format to be sued when the tape is positioned
at BOT and CAF is set to 1. Refer to Density Code field for valid format values. The
power-up default is 00h. This value is not changeable by the Host.
Active Partition: The field contains the partition number, which will become active
when the CAP bit is set to 1. The drive supports 2 partitions: When set to 0, the Data
Partition is selected. When set to 1, the Directory Partition is selected. To set the
Active Partition to one, FDP must also be set in Page 11h.
Write Buffer Full Ratio: On WRITE commands, this field indicates to the target how
full the buffer shall be before writing data to the media. This field is not changeable
and is ignored. The drive buffer will hold up to 28 frames of user data. When writing,
the drive will start tape motion when 10 frames hare assembled in the buffer.
Read Buffer Empty Ratio: On READ commands, this field indicates to the target
how empty the buffer shall be before retrieving additional data from the media. This
field is not changeable and is ignored. The drive buffer will hold up to 28 frames of
user data. When reading, the drive will start tape movement when the buffer has free
space for a minimum of 16 frames.