Power adapter for Hitachi X Mobile 250G USB hard disk

  • Thread starter Thread starter Man-wai Chang to The Door (33600bps)
  • Start date Start date
M

Man-wai Chang to The Door (33600bps)

This beast, with 2 USB ports (A-B) in its cable, draws a lot of power. I
found that most older PCs just can't power it. So I plan to buy a DC
power adaptor for it, as this beast has a DC in!

What approximate voltage & current should I look for?

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Man-wai Chang to The Door (33600bps) said:
This beast, with 2 USB ports (A-B) in its cable, draws a lot of power. I
found that most older PCs just can't power it. So I plan to buy a DC
power adaptor for it, as this beast has a DC in!
Click to expand...
What approximate voltage & current should I look for?
Click to expand...

You also need to look at plug measures and polarity.

The first place to look is incidentially the device itself,
as most state their voltage and cuttent ratings on the product label.

Arno
 
Man-wai Chang to The Door (33600bps) said:
This beast, with 2 USB ports (A-B) in its cable, draws a lot of
power. I found that most older PCs just can't power it. So I plan to buy a DC power adaptor for it, as this beast has
a DC in!
Click to expand...
What approximate voltage & current should I look for?
Click to expand...

What the device says it needs.

Or just get a much better 250GB external drive, the best of them dont need anything special power wise.
 
What the device says it needs.

I am unable to find relevant information from Hitachi's website.
Or just get a much better 250GB external drive, the best of
them dont need anything special power wise.
Click to expand...

Well, don't wanna waste it. :)

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.34
^ ^ 11:23:01 up 5 days 14:34 2 users load average: 1.08 1.03 1.01
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http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
 
You also need to look at plug measures and polarity.
The first place to look is incidentially the device itself,
as most state their voltage and cuttent ratings on the product label.
Click to expand...

Maybe I should just shell out some more money to buy a powered USB hub...

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and Farce be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.34
^ ^ 11:23:01 up 5 days 14:34 2 users load average: 1.08 1.03 1.01
ä¸å€Ÿè²¸! ä¸è©é¨™! ä¸æ´äº¤! ä¸æ‰“交! ä¸æ‰“劫! ä¸è‡ªæ®º! è«‹è€ƒæ…®ç¶œæ´ (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
 
Man-wai Chang to The Door (33600bps) wrote
I am unable to find relevant information from Hitachi's website.
Click to expand...

If you can get something to tell you what drive is inside, the drive info will be in the drive datasheet.

Add a bit for the bridge, but that will usually be covered by the next rounding up on the current.
 
This beast, with 2 USB ports (A-B) in its cable, draws a lot of power. I
found that most older PCs just can't power it. So I plan to buy a DC
power adaptor for it, as this beast has a DC in!

What approximate voltage & current should I look for?
Click to expand...

I see you have already received an answer from Hitachi, but a USB
Y-cable would have suggested a power requirement of 2 x 500mA @ 5V.

This is because a standard USB port is current limited to 500mA.

You could have determined the polarity by testing for continuity
between the USB ground pin and each of the terminals at the DC socket.

- Franc Zabkar
 
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