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abishur
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Re: Powering Hard Drive

Fri Feb 10, 2012 8:58 pm

I was looking at my internal 3.5" hard drive the other day and noticed that it had a 12V and a 5V listing (12V .5A, 5V .85A)  is this implying that I could theoretically power it on a 5V rail.  It would take a higher current, but work, right?
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nullstring
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Re: Powering Hard Drive

Fri Feb 10, 2012 9:20 pm

Abishur said:


I was looking at my internal 3.5" hard drive the other day and noticed that it had a 12V and a 5V listing (12V .5A, 5V .85A)  is this implying that I could theoretically power it on a 5V rail.  It would take a higher current, but work, right?


I am pretty sure that a HDD uses both 12v and 5v.. not either/or.

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alexandru.cucu
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Re: Powering Hard Drive

Fri Feb 10, 2012 10:21 pm

They usually use 12V for the motor and head moving mechanism. The 5V are used by the logic board.
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abishur
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Re: Powering Hard Drive

Fri Feb 10, 2012 10:27 pm

Ah, that makes a lot more sense!  Thanks guys.
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Re: Powering Hard Drive

Sat Feb 11, 2012 1:27 am

I think all 2.5" HDD use only 5V so that's an option to explore.

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Vindicator
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Re: Powering Hard Drive

Sat Feb 11, 2012 7:37 am

I mentioned this in another thread that the external full size drives have a board in them that will do this for you, I have a Seagate external drive that I stole the 1.5 Tb drive out of and have used it to hook up other drives for external use.

I have one for the laptop drives also and it will power straight from the USB port but the Raspi will not support it directly as I can tell, but through a powered hub it should work great if the kernel can find it. (it works on a pentium4 system without problems)

I will be trying an old Xbox 360 120Gb drive that was pulled from a RROD (red ring of death) system and repartitioned it and is running on a Pentium 4 system with Ubuntu.
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Lob0426
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Re: Powering Hard Drive

Sat Feb 11, 2012 8:00 am

2.5" HDD are 5v only. They could be run with jumper wires from the 5v source (micro USB) for the RasPi if it had more amperage available than the RasPi needs ( I would use as high of amperage as I could find, like 1.25 amps or so, remember surge). I built a internal USB harness with switch to run a USB HDD inside the case and could switch it off to protect the drive from viruses. It ran completely off of the USB pins on my Atom 330 board. There are nine pins but only eight are used.

The 3.5" drives need 12v and 5v. I should make up a wiring diagram of it but all of the information I needed to get it done is on the internet. I also ran a 3.5" external USB drive by cutting the power cord and plugging it into only the 12v lines of a MOLEX (IDE power). The board inside the USB enclosure handles the 12v and the 5v itself. The USB cable only needed the Data+ and Data- I actually connected all four wires just to be sure. This harness was also switched. Not all of the external enclosures may work this way.
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nichobb
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Re: Powering Hard Drive

Sat Feb 11, 2012 1:24 pm

amazon.co.uk/IOMAX-External-Enclosure-Laptop-Powered/dp/B001ALPWUQ/ref=sr_1_13?s=computers&ie=UTF8&qid=1328966252&sr=1-13

I got something like this when ordered a new 2.5 drive. 1 usb port data, other power. Works really well (does drain tablet a bit though). It wasn"t this model and am not recommending this one as never used, just an example btw.

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