RE: [cobalt-users] 7200 rpm hard drives

["Robert Fitzpatrick" <robert@xxxxxxxxxxx>]

> > 
> > 	They were Western Digital
> > 	 5 VDC  0.8A
> > 	12 VDC  0.45A
> > 
> It's not necessarily the average power figures you need, but 
> the max power drain is often drawn at spin-up time...

I have compared two other Maxtor 5400 RPM drives to the 7200 RPM model I
have now:

12VDC        5400A    5400B    7200
Spin-Up       2100     1800    1376
Seek           740      650     434
Read/Write     295      250     455
Idle           230      250     358
Standby         20       20      35

5VDC         5400A    5400B    7200
Spin-Up        275      600     751
Seek           420      550     540
Read/Write     440      550     429
Idle           380      500     388
Standby        220      200      65

Watts         5400A    5400B    7200
Spin-Up     UNKNOWN  UNKNOWN    20.3
Seek           11.0     10.6     7.9
Read/Write      5.7      5.8     7.6
Idle            4.7      5.5     6.2
Standby         1.3      1.3     0.8

All is in MA, what do you think of these stats? Do you think the 7200
RPM drives, which in a lot of cases run at lower MA than the 5400 RPM
drives, should work without heat problems. The only thing that stands
out above is the Spin-Up rate for the 7200 RPM at 5V. When does it use
5V and when 12V? And how often does Spin up play a part, the watts for
Spin-Up on the 7200 RPM is 20.3.

--
Robert