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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //usr/share/doc/sg3_utils/README.sg_start

Hi,

you can use sg_start to start (spin-up, 1) and stop (spin-down, 0) devices.
I also offers a parameter (-s) to send a synchronize cache command to a
device, so it should write back its internal buffers to the medium.

Be aware that the Linux SCSI subsystem at this time does not automatically
starts stopped devices, so stopping a device which is in use may have fatal
results for you.

So, you should apply with care.
I use it in my shutdown script at the end (before the poweroff command):

# SG_SHUG_NOS is set in my config file rc.config
# SG_SHUT_NOS="0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15"
if test -x /bin/sg_start; then
    if test "`basename $command`" = "reboot"; then
        for no in $SG_SHUT_NOS;
	      do /bin/sg_start /dev/sg$no -s >/dev/null 2>&1; 
	 done
    else
        for no in $SG_SHUT_NOS;
	    do /bin/sg_start /dev/sg$no -s 0 >/dev/null 2>&1;
        done
    fi
fi

Enjoy!
					Kurt Garloff <garloff at suse dot de>


Postscript
==========
sg_start has been reworked to allow a block device (e.g. /dev/sda) in
addition to the sg device name (e.g. /dev/sg0) in the lk 2.6 series.
sg_start now has more command line options, see its man page.

	Douglas Gilbert <dgilbert at interlog dot com> 2004/5/8

haha - 2025