[kwlug-disc] powering Seagate USB external disk off and on from Linux?

[Khalid Baheyeldin]

I don't know about USB drives, but I do something similar in
a trayless SATA drive bay, similar to this one
<https://www.memoryexpress.com/Products/MX26764>, which takes
regular 3.5 SATA drives.

Using such a bay allows me to rotate the disk off site.

Since the disk is used only once a day, I tell the disk to sleep after
a certain amount of time with no activity, using this command:

sudo hdparm -S 60 /dev/sdd1

Bonus:
Before I eject the disk, I do this:

DISK=/dev/sdd

# Spin down the disk
echo "Spinning down $DISK ..."
sudo hdparm -Y $DISK

# Stop/disconnect the disk
echo "Disconnecting $DISK ..."

DEVICE=`basename $DISK`
echo 1 | sudo tee /sys/block/$DEVICE/device/delete

No idea if the above applies to UAS. I vaguely recall that
I tried the above and it didn't work, or worked with a certain
disk, but not the other because of a specific chipset.
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