How to design USB cable to connect 40GB hard disk

[s_s_525]

how can design USB Cable to connect hard disk 40 GB ?

1 - i need help in design the Circit .

2- convert the 5 volt from the USB to 4-pin 12 volt HD power cad .

thanks

 

[prd]

Re: Design USB cable

Check power require for your H/D.
Standard USB can supply 5V 500mA max (2.5Wmax).
If the power enough for your H/D I think step up converter circuit (5V to 12V) can be used.

 

[s_s_525]

Re: Design USB cable

converter circuit (5V to 12V) can be used ????

Added after 5 minutes:

what abut design USB Cable to connect hard disk ?
do eny body know how can i design USB Cable to connect hard disk ?

Added after 3 minutes:

converter circuit (5V to 12V) can be used ????

 

[prd]

Re: Design USB cable

Hi s_s_525,

Please help explain, if I mis-understand your requirement ?
From the question,
1. You want to design USB Cable to connect hard disk 40 GB ? Do I Right !?!
2. The HD power require both 5V and 12V supply ??
So I advice you to design converter circuit (5V to 12V, step up converter circuit) if USB port can supply the power required by your HD.

Do I mis-understand, Please help explain ???

prd

 

[pici192]

Re: Design USB cable

Hi!
I think so YES!
He want to use HDD like an external device, and he want to make cicuit what is convert USB standard to IDE.
I am interested to, in this stuf, thoes anyone have this kind of circuit free?!

Sorry for my bad english