Hitachi 100GB 7200 RPM HTE721010G9SA00 Manual Do Utilizador
Códigos do produto
HTE721010G9SA00
Travelstar E7K100 (Serial ATA) Hard Disk Drive Specification
50
The host system may select either the currently selected CHS translation addressing or LBA addressing on a
command-by-command basis by using the L bit in the DEVICE register. So a host system must set the L bit to 1 if
the host uses LBA Addressing mode.
command-by-command basis by using the L bit in the DEVICE register. So a host system must set the L bit to 1 if
the host uses LBA Addressing mode.
10.5.1 Logical CHS Addressing Mode
The logical CHS addressing is made up of three fields: the cylinder number, the head number and the sector number.
Sectors are numbered from 1 to the maximum value allowed by the current CHS translation mode but can not exceed
255(0FFh). Heads are numbered from 0 to the maximum value allowed by the current CHS translation mode but can
not exceed 15(0Fh). Cylinders are numbered from 0 to the maximum value allowed by the current CHS translation
mode but cannot exceed 65535(0FFFFh).
Sectors are numbered from 1 to the maximum value allowed by the current CHS translation mode but can not exceed
255(0FFh). Heads are numbered from 0 to the maximum value allowed by the current CHS translation mode but can
not exceed 15(0Fh). Cylinders are numbered from 0 to the maximum value allowed by the current CHS translation
mode but cannot exceed 65535(0FFFFh).
When the host selects a CHS translation mode using the INITIALIZE DEVICE PARAMETERS command, the host
requests the number of sectors per logical track and the number of heads per logical cylinder. The device then
computes the number of logical cylinders available in requested mode.
requests the number of sectors per logical track and the number of heads per logical cylinder. The device then
computes the number of logical cylinders available in requested mode.
The default CHS translation mode is described in the Identify Device Information. The current CHS translation
mode also is described in the Identify Device Information.
mode also is described in the Identify Device Information.
10.5.2 LBA Addressing Mode
Logical sectors on the device shall be linearly mapped with the first LBA addressed sector (sector 0) being the same
sector as the first logical CHS addressed sector ( cylinder 0, head 0, sector 1). Irrespective of the logical CHS
translation mode currently in effect, the LBA address of a given logical sector does not change. The following is
always true:
sector as the first logical CHS addressed sector ( cylinder 0, head 0, sector 1). Irrespective of the logical CHS
translation mode currently in effect, the LBA address of a given logical sector does not change. The following is
always true:
LBA = ( (cylinder * heads_per_cylinder + heads)
* sectors_per_track ) + sector - 1
where heads_per_cylinder and sectors_per_track are the current translation mode values.
On LBA addressing mode, the LBA value is set to the following register.
Device <--- LBA bits 27-24
LBA High <--- LBA bits 23-16
LBA Mid <--- LBA bits 15- 8
LBA Low <--- LBA bits 7- 0
10.6 Power management features
The power management feature set permits a host to modify the behavior in a manner which reduces the power
required to operate. The power management feature set provides a set of commands and a timer that enables a device
to implement low power consumption modes.
required to operate. The power management feature set provides a set of commands and a timer that enables a device
to implement low power consumption modes.
The drive implements the following set of functions:
• A Standby timer
• Idle command
• Idle Immediate command
• Sleep command
• Standby command
• Standby Immediate command
• Idle command
• Idle Immediate command
• Sleep command
• Standby command
• Standby Immediate command