[SunRescue] Re: expensive paperweights

[Dave Reader]

On Wed, 30 May 2001, Chad Fernandez wrote:

> I beg to differ on this.  My Elite runs hot, especailly on the bottom,
> but my IBM 3.5" 9gig drive runs just barely warm.  Unfortunetly, I can't

Hmm... i'm going to check mine when I get home then. I've not noticed any
of my 5.25" drives getting anywhere near as warm as my 3.5" SCSI's do.

OK, so the 811 case does have a small fan at the back, but even so..

anyway... just stumbled accross this while looking for the power
consumption figure for them...

	http://www.driveservice.com/bestwrst.htm

> remember the model on IBM drive, it is a 7800 rpm LVD running at Ultra
> speeds (40mb/sec), as I haven't gottrn my LVD cable in the mail yet. 

My Fujitsu 9Gb's (I have 3 in a raid cage) get warm even with an 80mm fan
in the front of the cage. I have a 4Gb variant in my desktop at home, and
that has 2 40mm fans mounted on the bottom to keep it cool.

anyway..

it's 11mS seek time, 5400rpm

	http://www.seagate.com/support/disc/scsi/st410800n.html


and they drink about 30 watts

	http://www.seagate.com/support/disc/specs/scsi/st410800n.html



having just looked up the drives I have in the server at home...

keep:/proc/scsi# cat scsi 
Attached devices: 
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: SEAGATE  Model: ST36530N         Rev: 1498
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 01 Lun: 00
  Vendor: SEAGATE  Model: ST34520N         Rev: 1444
  Type:   Direct-Access                    ANSI SCSI revision: 02

it seems that they burn about 12-15 watts..

	http://www.seagate.com/support/disc/specs/scsi/st34520n.html

so there's roughly a 1/3rd to 1/2 of the power dissipation in a much much
much much smaller box - hence the temperature they reach.

in the home desktop..

nifoc:~# cat /proc/scsi/scsi 
Attached devices: 
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: FUJITSU  Model: M2954E-512       Rev: 0164
  Type:   Direct-Access                    ANSI SCSI revision: 02

	http://207.158.208.219/M2954_specs.htm


ok.. well, i know that those 3.5" drive definately need the cooling. the
chippery on them get's /really/ hot. maybe its the size rather than the
actual power used.

i'll have a look at my Elite 9's later. it may be that they just cool off
much easier due to their size .. 30W for a brick that big isnt really a
lot.


dave.