硬盘不识别hdparm -S标志

Question

我的WD6400AAKS通过USB连接到一个覆盆子上。它包含在一个外部USB盒与接入LED.它在hdparm -y上工作得很好，并且可以旋转。如果你在那个驱动器上做个ls，它就会旋转。到目前一切尚好。不幸的是，它不承认-S。尝试过的-S 1，-S 12.hdparm返回正确，没有错误，但驱动器不会旋转，虽然没有访问指示的LED。有什么想法吗？

Answer 1

尝试将Advanced Power Management Feature设置为127。

hdparm手册：

-B     Get/set  Advanced  Power  Management feature, if the drive supports it. A low value
       means aggressive power management  and  a  high  value  means  better  performance.
       Possible  settings  range  from  values 1 through 127 (which permit spin-down), and
       values 128 through 254 (which do not permit  spin-down).   The  highest  degree  of
       power  management  is attained with a setting of 1, and the highest I/O performance
       with a setting of 254.  A value of 255  tells  hdparm  to  disable  Advanced  Power
       Management  altogether  on the drive (not all drives support disabling it, but most
       do).

通过将高级电源管理功能设置为低于128的值，可以使驱动器向下旋转。-S parameter用于设置所需空闲时间的超时，但如果高级电源管理功能关闭，固件可能不遵守该参数。