Текст страницы
8.8 Features Register
This register is command specific. This is used with the Set Features command, SMART Function Set command,
Format Unit command and Sanitize Device Feature Set command.
8.9 Sector Count Register
This register contains the number of sectors of data requested to be transferred on a read or write operation between
the host and the device. If the value in the register is set to 0, a count of 256 sectors (in 28-bit addressing) or 65,536
sectors (in 48-bit addressing) is specified.
If the register is zero at command completion, the command was successful. If not successfully completed, the
register contains the number of sectors which need to be transferred in order to complete the request.
The contents of the register are defined otherwise on some commands. These definitions are given in the command
descriptions.
8.10 Sector Number Register
This register contains the starting sector number for any disk data access for the subsequent command.
The sector number is from one to the maximum number of sectors per track.
This register contains Bits 0-7. At the end of the command, this register is updated to reflect the current LBA Bits 0-
7.
When 48-bit commands are used, the “most recently written” content contains LBA Bits 0-7, and the “previous content”
contains Bits 24-31.
51
Hard Disk Drive Specification