During move, power supply for 320GB Simpletech drive put in box with other power supplies. What is VDC rating of supply please?

It's available on Amazon:
http://www.amazon.com/T-Power-Adapter-SimpleTech-SimpleDrive-CHARGER/dp/B00AZ6GLVQ

I believe that you would be ok. Voltage has to be "Spot on." Amperage, however, needs to "meet or exceed." Think of Voltage as pushing something into something. Think of Amperage as pulling something out of something. It won't draw more amps than it needs, even if they are available. Allow me to thank you for including the powerpayless website as until your post I didn't know what voltage I was looking for. Exactly the same thing happened to me with my SimpleTech 1TB. Perhaps we both solved eachother's problems. PS: I'm going to check with Radio Shack for a 12v adaptor with at least 3.5 Amp capacity. They might can beat the $30.00 which is what the above mentioned place gets including shipping.

The power supply for the SimpleTech SimpleDrive Pinafarina is 12V, 2A tip positive.

The correct adapter is 12V 1.5A, 500 mA will not be enough current for the drive.

The SimpleDrive requires a 12V/2A tip positive power supply. A 14-17V supply might work, but you run the risk of damaging your drive.

The power supply specs are 12V, 2A tip positive.

Pin Name Color Description
1 3.3V Orange +3.3 VDC
2 3.3V Orange +3.3 VDC
3 COM Black Ground
4 5V Red +5 VDC
5 COM Black Ground
6 5V Red +5 VDC
7 COM Black Ground
8 PWR_OK Gray Power Ok (is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation)
9 5VSB Purple +5 VDC Standby Voltage (max 10mA)
10 12V Yellow +12 VDC
11 3.3V Orange +3.3 VDC
12 -12V Blue -12 VDC
13 COM Black Ground
14 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
15 COM Black Ground
16 COM Black Ground
17 COM Black Ground
18 -5V White -5 VDC
19 5V Red +5 VDC
20 5V Red +5 VDC

/PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply's /PSON input to ground, thereby switching the power supply to full-on condition.
18 AWG is recommended for all wires except pin 11, which should be 22 AWG. For 300W configurations 16 AWG is recommended.
There are several ATX variants.
Hope this helps.
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12V DC, 1.5A

It could be that it's internal power supply burnt out,
in which case the drive itself could still be fine.

Try opening up the external case, and removing the drive.
Once you do, plug it in to your computer directly using its SATA cables, and see if that works.

Hope I helped,
Tom

The original power supply is "SB2D-020-1HA SIMPLETECH AC ADAPTER 12V 1.5A FOR EXTERNAL HARD DRIVE" . Just find a replacement with the correct size plug (center positive) that supplies 12v DC at 1.5amps (1500ma)