Power Supply Amperage for External USB Disk Drive

What amperage range is acceptable for an external usb hard drive?

I have three 12 volt power supplies with 1.2amp, 4.0amp and 5.0amp.

Are any of them suitable for an external usb hard disk drive?
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More about power supply amperage external disk drive
  1. The larger WD externals ship with a power adapter that provides 1.5 amp at 12 volts.

    The 1.2 amp PS might work.
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