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I have a 2.5 inch SATA SSD that I want to power from an internal USB port. The SSD requires 5 volts, so I see this as being possible.

I already have the data connection for the SSD, I just need to power it over USB. I know this is possible because I have a PCMCIA card for a different machine that draws power from a USB port in this manner.

Are these types of cables already in production somewhere? If so, where?

If they're not (I haven't found any), what would I need to do to create one? I'm unfamiliar with how SATA power cables are wired out and don't want to fry my USB card with novice testing when I have the chance of getting insight from a SU expert.

Update: I don't want data travelling over USB. As I have a SATA data cable ready for this drive, I will be mounting it in the case and running the power to an internal USB cable.

I thank all of you for your answers regarding buying an external USB case for this drive, but that's not the question I'm asking.

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Typically, one would use an eSATA port to provide both power and data to the drive. Most eSATA ports also double as a USB port. Note that because of the power differences in laptops and desktops, laptops have limitations on what devices they can power in this manor. – earthmeLon Nov 16 '11 at 19:57
@earthmeLon I have yet to see eSATA provide power. Do you have a link with information on this? – Canadian Luke Nov 16 '11 at 20:02
If you are mounting it inside the case, then why would you be trying to use USB power, and not pulling directly from the power supply? – Zoredache Nov 16 '11 at 21:33
Why not? I know this is possible and this may have useful application in the future. – Tyler Faile Nov 16 '11 at 22:02
@earthmeLon: AFAIK, you need a Power over eSata to get enough power spin a harddrive off of one port. – surfasb Nov 17 '11 at 3:47

I don't see "offical" cables to do this, but there is a hardware hack here Stealing 5V from USB from Parallax inc forum. If nothing else, it shows how easy or hard it is to do (depending on your specific skills) and could be a starting path for your 5v needs.

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