IBM DTCA-24090 Hard Drive Specifications - Page 129

High. L=1

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12.15 Read Native Max LBA/CYL (F8h: Vendor Specific) Command Block Output Registers Register 76543210 Data Feature Sector Count Sector Number Cylinder Low Cylinder High Device/Head 1L1D Command 11111000 Command Block Input Registers Register 76543210 Data Error ...See Below... Sector Count Sector Number V V V V V V V V Cylinder Low V V V V V V V V Cylinder High V V V V V V V V Device/Head HHHH Status ...See Below... Error Register 76543210 CRC UNC 0 IDN 0 ABT T0N AMN 00000V00 Status Register 76543210 BSY RDY DF DSC DRQ COR IDX ERR 0V0 0 V Figure 75. Read Native Max LBA/CYL (F8h) This command returns the native max LBA/CYL of H D D which is not effected by Set Max LBA/CYL command. Output Parameters To The Device L LBA mode.Indicates the addressing mode.L=0 specifies CHS mode and L = 1 does LBA addressing mode. D The device number bit. Indicates that the device number bit of the Device/Head Register should be specified. D = 0 selects the master device and D = 1 selects the slave device. - Indicates that the bit is not used. Input Parameters From The Device Sector Number In LBA mode, this register contains native max LBA bits 0 - 7. ( L = 1 ) In CHS mode, this register contains native max sector number. ( L = 0 ) Cylinder High/Low In LBA mode, this register contains native max LBA bits 8 - 15 (Low), 16 - 23 (High). ( L = 1 ) In CHS mode, this register contains native max cylinder number. ( L = 0 ) H In LBA mode, this register contains native max LBA bits 24 - 27. ( L = 1 ) In CHS mode, this register contains native max head number.(L=0) Command Descriptions 121

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12.15
Read Native Max LBA/CYL (F8h: Vendor Specific)
Command Block Output Registers
Command Block Input Registers
Register
76543210
Register
76543210
Data
Data
Feature
Error
...See Below...
Sector Count
Sector Count
Sector Number
Sector Number
VVVVVVVV
Cylinder Low
Cylinder Low
VVVVVVVV
Cylinder High
Cylinder High
VVVVVVVV
Device/Head
1L1D
Device/Head
HHHH
Command
11111000
Status
...See Below...
Error Register
Status Register
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
CRC UNC
0
IDN
0
ABT T0N AMN
BSY RDY DF
DSC DRQ COR IDX ERR
0
0
0
0
0
V
0
0
0
V
0
0
V
Figure 75. Read Native Max LBA/CYL (F8h)
This command returns the native max LBA/CYL of HDD which is not effected by Set Max LBA/CYL
command.
Output Parameters To The Device
L
LBA mode.Indicates the addressing mode.L=0 specifies CHS mode and L=1 does
LBA addressing mode.
D
The device number bit.
Indicates that the device number bit of the Device/Head
Register should be specified.
D=0
selects the master device and D = 1
selects the
slave device.
-
Indicates that the bit is not used.
Input Parameters From The Device
Sector Number
In LBA mode, this register contains native max LBA bits
0 - 7. (L=1)
In CHS mode, this register contains native max sector number. (L=0)
Cylinder High/Low
In LBA mode, this register contains native max LBA bits
8 - 15 (Low),
16 - 23 (High). (L=1)
In CHS mode, this register contains native max cylinder number. (L=0)
H
In LBA mode, this register contains native max LBA bits
24 - 27. (L=1)
In CHS mode, this register contains native max head number.(L=0)
Command Descriptions
121