How do I know which unpowered USB HDs are compatible with Time Capsule?

Hi all
I've now tried a couple of different unpowered USB drives in my Time Capsule and been unable to find one that works.
I know that the Airport Utility needs to be configured to configure the Capsule for sharing.  I know that the drive should be formatted as journalled.  I have had HDs work well that are powered independantly.  I know that unpowered drives that draw excessive power would be problematic; althought the drives I've tried draw 2mA which is hardly much.  All of that said, I can only get powered HDs working, and not unpowered.
Any helpful ideas?
Much appreciated!
Thanks and regards
Daniel

Bob Timmons wrote:
Due to poor design, the Time Capsule power supply has enough of a problem just powering the hard drive and router portion of the product. Adding more load to an overtaxed power supply...which tends to overheat easily....would not be recommended if you want to prolong the life of the Time Capsule.
Pay particular attention to this.. Bob is a smart bloke.. 
The power supply of the TC is barely adequate.. having repaired 100 or more now.. let me assure you the last thing it needs is more load.
Also note the power consumption of a standard 2.5" drive..
I have several lying arond here.. 40GB fujitsu.. 5v 0.55a
80GB hitachi.. 5v 1A
Well those are old drives..
500GB Seagate Momentus 7200.4 which is a standard drive used now in laptops and faster speed.
5v 0.451A
Sounds great.. just below the 500ma limit.. but download the manual for the drive.
Table 3:          DC power
Power dissipation  +5V input average (25° C)
Spinup (max)  1.0 amps
Seek   2.2 watts
Read   2.1 watts
Write   2.2 watts
Idle, performance*  1.4 watts
Idle, active*  1.0 watts 
Idle, low power mode*   0.69 watts
Standby  0.20 watts
Sleep  0.20 watts
The actual current draw during spinup.. is 1A.. not 0.45 as per the drive label.. that is normal usage not spinup.
Also remember a USB powered hard disk has to power the electronics of the USB to sata adapter.. that might be 2ma.. you quoted.. ie no drive.. but it absolutely is no where near enough.. even in standby or sleep the drive is drawing.. 40ma..
That is from the actual spec sheet.

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