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I`ve bought a new disk (HDD, WD purple) but instead of
replacing the old, I disconnected internal DVD recorder and
I moved the old one there (I had no spare "molex" nor esata
channels left).
Now I have found a strange thing : the timing of the facts
is too suspicious to be decorrelated : my USB alcatel model
fails to be charged at a pace fast enough to keep up with
battery consumption and after 1-2 hours of intense use,
switches off.
I am thinking the power (we call it "alimentatore" but dunno
the English word ... the power source, let`s say) is
insufficient to cover up all devices properly and fails to
send enough current to external devices (the HDD behaves
normally)
now the true question (The drive currently is mounted via FSTAB)
would unmount the drive cause it to stop spinning ?
There is a faster way to sendo some low level command to
make it stop spinning ? I.g. some "IOCTL" sequence.
the /dev/sde1 interface for the block device can receive
IOCTLs codes (assuming I`d be able to find proper commands
to send to the controller).
The drive will be seldom used (I don`t have a big enough
extern box to build an USB unit)
I`d largely prefer to send direct commands to stop spinning
and park the heads to unmounting (assumed unmounting will
cut power consumption, thing that I dunno, actually), since
later the drive would still be responding requests,
automatically restarting spinning on receiving requests, I
guess.
for those really knowledgeable in internal Linux working :
does a drive not actively used (no files opened, no file
manager operating on it) require some form of "polling" its
state that would cause frequent automatical restartig of
spinning ? In this case, stopping it would be harmful and
enhance preature wearing of the motors and all and it would
have no benefit to manually stop spinning.
I ask this latter because I have an INTENSO 4 TB external
drive (a monster of speed, it reaches 160 MB/s !) that on
another machine (always debian / MX) frequently stops and
later at some time for no apparent reason at all restarts
spinning (there the blue led makes it further evident beyond
the ears can probe). Now surely it could be the internal
"controller" aggressive power saving strategies, independent
on the OS, to switch the drive off even if no "warranty" of
no further requests was given by the OS (unmounting for
examople).
But that is an USB external device and such strategies seem
reasonable.
I dunno if a drive connected on esata and molex is allowed
to decide alike (or if the OS can / must somehow save power
if the disk is not in active use).
If sb knows about this topic, pls share opinions.
tnx
-- CCCPMario or MarioCCCP
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