Sony SDX-800V/R manual Medium Partitions Parameter Page 11h, IDP Psum

6.Command Specification MODE SELECT

6.7.5. Medium Partitions Parameter Page (11h)

The drive supports the Medium Partitions Parameter Page, which has the following format:

Table 6-43: Medium Partitions Parameter Page

Bit	7	6	5	4		3	2	1	0
Byte
0	PS (0)	Reserved				Page Code (11h)
1				Page Length (0Ah)
2			Maximum Additional Partitions (0h)
3			Additional Partitions Defined (00h)
4	FDP (0)	SDP (0)	IDP		PSUM			Reserved
5			Medium Format Recognition (03h)
6		Reserved					Partition Units
7					Reserved
8	(MSB)			Partition Size (Partition 0)
9									(LSB)
10	(MSB)			Partition Size (Partition 1)
11									(LSB)

Warning: This page is used to format a tape to one partition. Extreme care must be used with this parameter page to avoid accidental reformatting of a tape. Reformatting will destroy all previous data.

Maximum Additional Partitions: This field is only valid on MODE SENSE where it is used to report the maximum number of additional partitions that are supported by the drive. This field is non-changeable, however it accepts all values as a don’t care. This number is the maximum number of additional partitions supported.

Additional Partitions Defined: This field specifies the number of additional partitions to be defined for the tape based on the IDP bit. The maximum allowed is the value returned in the Maximum Additional Partitions field.

FDP: The Fixed Data Partitions bit is not supported by the drive and if set, a CHECK CONDITION status is returned with an ILLEGAL REQUEST Sense Key set.

SDP: The Select Data Partitions bit is not supported by the drive and if set, a CHECK CONDITION status is returned with an ILLEGAL REQUEST Sense Key set.

IDP: The Initiator Defined Partitions bit is supported and, when set to one, indicates that the tape shall be partitioned based on the Additional Partitions Defined field, PSUM and Partition Size field.

PSUM: The Partition Size Unit of Measured field defines the units in which the Partition Size value selects the partition size.

Table 6-44: PSUM values

Code	Description	Support
00b	bytes (unit of one)	Not Support
01b	kilobytes (103 bytes)	Not Support
10b	Megabytes (106 bytes)	Optional
11b	10 (PARTITION UNITS) bytes	Optional

Partition Units: This field defines the size of the partition size descriptors when the PSUM field is set to 11b. A value of n in the PARTITION UNITS field shall define the units of the partition size descriptors as 10n bytes.

SDX-800V Supports following combinations.

PSUM	Partition Units
10b	0000b: megabyte (AIT-1/2 Mode, AIT-E Turbo, AIT-1 Turbo)
	11b	0111b: 107	byte (AIT-3 Mode, AIT-2 Turbo)
	11b	1001b: 109	byte (AIT-3Ex Mode)

If another value is set these fields a CHECK CONDITION status is returned with an ILLEGAL REQUEST sense key set.

6-46 SONY AIT-3Ex drive SDX-800V series Ver.1.1