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ATA和ATAPI类型硬盘区别方法

2010-08-26 17:37 896 查看

ATA和ATAPI类型硬盘区别方法
2010-05-21 17:48

目前，计算机主板IDE控制器连接的硬盘有ATA（AT Attachment）类型和ATAPI（AT Attachment Packet Interface）类型。那么，软件程序BIOS或者Linux内核是如何才能识别出硬盘是那种类型的呢？
在参考文档[1]中，定义了识别硬盘类型的方法，如下所示：
A device not implementing the PACKET command feature set shall place the signature in the Command Block registers listed below for power-on reset, hardware reset, software reset, and the EXECUTE DEVICE DIAGNOSTIC command.
If the device does not implement the PACKET command feature set, the signature shall be:
Sector Count 01h
LBA Low 01h
LBA Mid 00h
LBA High 00h
Device 00h
A device implementing the PACKET command feature set shall place the signature in the Command Block registers listed below for power-on reset, hardware reset, software reset, the EXECUTE DEVICE DIAGNOSTIC command, and the DEVICE RESET command.
If the device implements the PACKET command feature set, the signature shall be:
Sector Count 01h
LBA Low 01h
LBA Mid 14h
LBA High EBh
Device 000x0000b where x equals 0 except when responding to a
DEVICE RESET, IDENTIFY DEVICE, or READ SECTOR(S)
command. For a DEVICE RESET, IDENTIFY DEVICE, or
READ SECTOR(S) command the value of x is not changed
from that existing when the command is written to the
Command register.
在经过软件复位或者硬件复位等操作后，比较LBA Mid和LBA High寄存器中的值是否分别是14h和EBh，就可知连接的硬盘是ATA（AT Attachment）类型还是ATAPI（AT Attachment Packet Interface）类型。
参考文档：
[1]. Information Technology – AT Attachment with Packet Interface – 6(ATA /ATAPI-6)

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