Use a notebook ac adapter as power supply for external usb hard drive? Tags: Power Supplies Notebooks Hard Drives External USB Components Last response: April 2, 2012 10:42 PM in Components Share okppko April 2, 2012 6:16:52 PM Notebook power supply ac adapter: input: 100-240v ~ 1.4A 50/60Hz output 19V – 4.74A Can the ac adapter be build into a power supply for an 3.5” external usb hard drive? If so, can the ac adapter be used for both 3.5” and 2.5” external usb hard drives? Thanks. More about : notebook adapter power supply external usb hard drive mbarnes86 a b ) Power supply April 2, 2012 9:44:31 PM Hi If you want to destroy your Hard Drive electronics go ahead. Read voltage markings on external hard drive case or instructions. Use only correctly rated power supply 2.5" drive probably requires 5V regulated 3.5" drive probably requires 5V + 12V regulated unless hard drive case has its own built in regulator then probably 12V also get polarity wrong and burn out hard drive electronics. (if you are lucky only USB to ATA or USB to SATA electronics burnt out) regards Mike Barnes hairystuff a b ) Power supply April 2, 2012 10:42:16 PM You could use a couple of regulator IC to reduce the voltage down to the required amounts (LM2940 for 12volts) and (LM7805 for 5volts), but it would be simpler and safer to get a pre-made hard drive psu with a 4 pin molex and sata power connecter. Can't find your answer ? Ask ! Publish Related resources usb powered external hard drive vs ac powered Forum SolvedIs it okay to leave external hard drive's AC adapter plugged in after I disconnect it from the drive? Forum can i power a 3.5 inch Sata drive using usb adapter from 2.5 inch external drive? Forum 1TB external hard drive with no power supply, USb 3/seagate /western digital/,ex Forum EXTERNAL USB HARD DRIVE power supply Forum Solvedexternal hard drive replacement power supply Forum Solvedexternal hard drive replacement power supply Forum Solvedexternal hard drive power supply Forum SolvedPSU without power supply adapter 100-240AC Forum Seagate 1.5TB External Hard Drive Wrong Power Supply Forum How to use laptop hard drive as a external usb drive Forum Adapter for USB external hard drive to eSata port on computer Forum Can I use Secure Erase on my external usb hard drive Forum 4TB External USB3 hard drive not visible after power failure Forum SolvedHow to power external hard drive with usb Forum Can I plug my US iomega external hard drive in a UK plug by using only an adapter? Will it blow up because of the voltage diff Forum Replacement Power Adapter media external hard drive Forum How to know if an external hard drive can be used on notebook Forum External Hard Drive ---> Power supply or no? (What do you recommend?) Forum External hard drive power adapter Forum More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !