Correct way to disconnect/eject an USB hard disk ?
Manish Jain
bourne.identity at hotmail.com
Wed Aug 19 16:50:54 UTC 2020
On 2020-08-19 21:12, Gary Aitken wrote:
> Can you explain why I have seen umount commands return, and then the
> USB device "activity" light keeps blinking? I have on occasion waited
> for a while and it keeps blinking, and eventually I just unplugged it.
No idea, Gary.
But umount only returns when pending I/O has been flushed to the device.
If the device's activity LED still keeps blinking, there are two
explanations I can think of :
1) The LED sensor is either faulty or is simply signalling availability
of power (in case there is no separate power LED).
2) The device has some internal flash storage intermediate to its main
storage area. While umount could return when data has been sent into the
flash buffer, the device still has to internally reallocate the data to
main storage (as might be the case with SSHD: solid state hybrid disk).
In such case, it would be prudent to wait for the LED to stop blinking
before unplugging the device. But if the LED keeps blinking forever, I
would think there is some fault with the LED itself.
Poly, your comments ?
Regards,
Manish Jain
More information about the freebsd-questions
mailing list