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External Hard drive Power Requirement

Last response: in Storage
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May 16, 2011 5:09:28 PM

Hello,
I was wondering how you determine how much power is needed to run a WD Passport SE 750GB hard drive. It gets power from the usb port
a c 383 G Storage
May 16, 2011 6:01:25 PM

USB 2.0 can only put out 5V at 500mA. Anything higher will require a power brick for the drive.
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May 17, 2011 5:58:09 PM

Or a cable with 2 USB connectors (1Amp at 5V).
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a b G Storage
May 17, 2011 8:49:00 PM

palldat said:
Hello,
I was wondering how you determine how much power is needed to run a WD Passport SE 750GB hard drive. It gets power from the usb port

Since it uses a WD Scorpio Blue 750 GB Mobile Hard Drive:

Electrical Specifications
+5 VDC Current Requirements
Read/Write : 500 mA (2.5 Watts)
Idle : 400 mA (2.0 Watts)
Standby : 50 mA (0.25 Watts)
Sleep : 20 mA (0.1 Watts)
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!