Results 1 to 10 of 10

Thread: External Hard Drive Power Adapters

  1. #1
    Variable Bitrate
    Join Date
    Sep 2005
    Location
    Pomona, CA
    Posts
    340

    External Hard Drive Power Adapters

    I think this is the right place to ask this:

    I have an external drive that I want to add to my computer and am probably going to end up connecting the power directly to the PSU via a molex connector. I know not all external drives have the same rated "power bricks" or power adapters, but if I connect one to the PSU in this way, wouldn't it just grab as much power as it needs no matter what the power adapter gives it? I just don't want the power from it to do anything to the HD like fry it or anything. A fuse would probably protect it right?

    Thanks
    Carputer Progress:

    Re-do fabrication of screen [DONE]
    Add mini-USB and micro-USB power from M2-ATX [DONE]
    Teardown PC [100%]
    Add HDMI > VGA converter [0%]

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
    Join Date
    Apr 2004
    Location
    Elsewhere
    Posts
    13,949
    Quote Originally Posted by fatejd View Post
    I think this is the right place to ask this:
    Not really, but I moved it.
    Hardware Development subforum is for people designing new hardware. Sound logic, though.

    I have an external drive that I want to add to my computer and am probably going to end up connecting the power directly to the PSU via a molex connector. I know not all external drives have the same rated "power bricks" or power adapters, but if I connect one to the PSU in this way, wouldn't it just grab as much power as it needs no matter what the power adapter gives it? I just don't want the power from it to do anything to the HD like fry it or anything. A fuse would probably protect it right?

    Thanks
    No. That's not correct. Let's say the external hard drive requires 5v and you provide it 12v. You're providing 2.2 X the rated power, which it won't be able to handle. You'll destroy the device if you provide too much power.
    Too little power will likely result in the device not working and probably won't damage it.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
    Variable Bitrate
    Join Date
    Sep 2005
    Location
    Pomona, CA
    Posts
    340
    Quote Originally Posted by DarquePervert View Post
    Not really, but I moved it.
    Hardware Development subforum is for people designing new hardware. Sound logic, though.


    No. That's not correct. Let's say the external hard drive requires 5v and you provide it 12v. You're providing 2.2 X the rated power, which it won't be able to handle. You'll destroy the device if you provide too much power.
    Too little power will likely result in the device not working and probably won't damage it.
    So, I should probably use the supplied brick and "alter" the plug (i.e. cut off the wall plug and get the power and ground wires) to attach to the molex, right?
    Carputer Progress:

    Re-do fabrication of screen [DONE]
    Add mini-USB and micro-USB power from M2-ATX [DONE]
    Teardown PC [100%]
    Add HDMI > VGA converter [0%]

  4. #4
    DIGItonium
    Guest
    Bypass the power circuitry that powers the drive (i.e., disconnect the power connector of the hard drive). Then connect the 4-pin Molex to the drive with the PSU.

    Here's the catch - I'm assuming this is a USB external hard drive. You'll need to power the USB=>IDE adapter since I doubt it is getting power from the USB connector, itself.

    What you could've done is get a blank external hard drive case, and then grab a USB-to-IDE or SATA-to-IDE adapter. Then Have the larger 4-pin Molex power the drive, while the smaller 4-pin Molex power the USB or SATA adapter. Ah, look here! The adapter below does it all!

    http://www.addonics.com/products/io/adideu2.asp

  5. #5
    Variable Bitrate
    Join Date
    Sep 2005
    Location
    Pomona, CA
    Posts
    340
    I might look into that, thanks for the info. If I ever give up on the external HD idea, this would be an easy conversion of an internal IDE HD.
    Carputer Progress:

    Re-do fabrication of screen [DONE]
    Add mini-USB and micro-USB power from M2-ATX [DONE]
    Teardown PC [100%]
    Add HDMI > VGA converter [0%]

  6. #6
    Constant Bitrate Vineet Singh's Avatar
    Join Date
    Jul 2003
    Location
    Naperville IL
    Posts
    166
    Another, only $15

    http://www.tigerdirect.com/applicati...1205&CatId=470

    Looks like it uses a standard molex just for the drive.

    91 Stealth RT/TT
    CarPuter: Inspiron 5150 P4 3.0ghz; Built-in WiFi; Deluo GPS; Radio Shark; OBD1; Nostromo Speedpad
    Audio: Audigy 2 NX; Clarion 500.5 amp; 100.2 center channel amp; Kicker Solo-baric L7 10" Sub
    Display: Lilliput 7" Touchscreen

  7. #7
    Variable Bitrate
    Join Date
    Sep 2006
    Location
    Richmond, Tx: USA
    Posts
    328
    Quote Originally Posted by Vineet Singh View Post
    Another, only $15

    http://www.tigerdirect.com/applicati...1205&CatId=470

    Looks like it uses a standard molex just for the drive.
    you'll still need external power brick to make it work (look at the pics)

  8. #8
    Variable Bitrate
    Join Date
    Sep 2005
    Location
    Pomona, CA
    Posts
    340
    I got a SATA > USB converter and SATA power > molex converter from newegg - now I'll be set once I get my HD replaced from Seagate
    Carputer Progress:

    Re-do fabrication of screen [DONE]
    Add mini-USB and micro-USB power from M2-ATX [DONE]
    Teardown PC [100%]
    Add HDMI > VGA converter [0%]

  9. #9
    DIGItonium
    Guest
    ^ Good luck! It's so simple, but I always cross my fingers the hardware gets detected properly. I'm using a SATA CF adapter on an Intel board. XP just refuses to detect the storage medium.

  10. #10
    Variable Bitrate
    Join Date
    Sep 2005
    Location
    Pomona, CA
    Posts
    340
    That stuff will be here on Monday, but I have to send my drive into Seagate to get replaced, so it will be a little while before I can test this out for sure, unless I just jack a HD out of my computer for testing.
    Carputer Progress:

    Re-do fabrication of screen [DONE]
    Add mini-USB and micro-USB power from M2-ATX [DONE]
    Teardown PC [100%]
    Add HDMI > VGA converter [0%]

Similar Threads

  1. Replies: 7
    Last Post: 09-27-2006, 09:45 AM
  2. Anybody used an external hard drive?
    By fatejd in forum General Hardware Discussion
    Replies: 1
    Last Post: 01-11-2006, 08:28 PM
  3. annoying restart needed for laptop to detect external usb hard drive
    By minghi in forum General Hardware Discussion
    Replies: 8
    Last Post: 04-07-2005, 12:37 PM
  4. should i be turning my external hard drive off on freezing nights
    By Sonicxtacy02 in forum General Hardware Discussion
    Replies: 15
    Last Post: 11-17-2004, 12:34 PM
  5. laptop external hard drive question
    By Kato in forum Power Supplies
    Replies: 2
    Last Post: 06-15-2004, 01:45 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •