My SAMSUNG HM251JJ also suffers this problem.
If hdparm sets -B128, it sticks:
sudo hdparm -B128 /dev/sda
/dev/sda:
setting Advanced Power Management level to 0x80 (128)
APM_level = 128
And as per the hdparm manpage, it does not spin down. Ever.
But if it sets -B127, the hard disk assumes a value of 1:
sudo hdparm -B127 /dev/sda
/dev/sda:
setting Advanced Power Management level to 0x7f (127)
APM_level = 1
And it starts to spin down a lot more than it should, sometimes even
during disk reads!
hdparm -i shows:
/dev/sda:
Model=SAMSUNG HM251JJ, FwRev=2AA00_00, SerialNo=xxxx
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4
BuffType=DualPortCache, BuffSize=16384kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=488397168
IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6
AdvancedPM=yes: disabled (255) WriteCache=enabled
Drive conforms to: ATA/ATAPI-7 T13 1532D revision 0: ATA/ATAPI-1,2,3,4,5,6,7
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https://bugs.launchpad.net/bugs/913050
Title:
Explicit APM values in hdparm-functions cause Load Cycle Count hell
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