Power Supply Amperage for External USB Disk Drive Tags: Hard Drives Power Supplies External USB Disk Drive Storage Last response: April 8, 2012 12:12 PM in Storage Share infocorp9 April 8, 2012 12:02:54 PM 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? More about : power supply amperage external usb disk drive jsc a c 144 ) Power supply a b G Storage April 8, 2012 12:12:16 PM The larger WD externals ship with a power adapter that provides 1.5 amp at 12 volts. The 1.2 amp PS might work. Can't find your answer ? Ask ! Publish Related resources: ForumWd 500gb external hard drive wrong power supply ForumPower supply for Maxtor OneTouch Plus 4 External HDD ForumHow to check external USB power supplies etc ForumHow much amperage do i have on a dual 12 v rail . Advice required . ForumExternal USB HDD Case, PSU doesn't supply enough power ForumUSB port doesn't have enough power / voltage / amperage ? Forum1TB external hard drive with no power supply , USb 3/seagate /western digital/,ex ForumUse a notebook ac adapter as power supply for external usb hard drive ? ForumBigger power supply bad for my mobo? ForumHow to power external hard drive with usb ForumIomega 2TB external USB is drive silent and not recognized ForumComputers Amperage ForumUsb driver for WD external mass storage drive windows xp Forum6450 Amperage ? Cheap PSU ForumDo I Need A New Power Supply if... Forum4tb hdd is being read as 2tb hdd ForumExternal Hard drive not recognised Forum[Solved] Hard Drive Cache ? ForumCan I add drive to existing drive in raid 0 ForumHard Drive not detected More resources Read discussions in other Storage categories Hard Drives DVD Drives DVD Writers Optical Media Flash Media NAS/RAID SSD Western Digital !