RE: [cobalt-users] 7200 rpm hard drives

["Neil Stringer" <neil@xxxxxxxxxxxxxxx>]

Robert wrote
> > 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.

Those 12v read/write, idle and standy currents concern me.  What this
says is that the 7200 uses far more 12v electrons than the slower
drives...

The 5V is much 'calmer' and does not worry me so...

But my biggest 'fear' is the spin up watts.  You have a 60 watt PSU.
You put two of these puppies in and there consumption at power on is 40
Watts...  Gives you 20 to run everything else!

Go to the PSU manufactures website and check the specs of the PSU...
--
Neil