non external powered drive?

TechSupp · 22-09-2008, 08:25 PM

I have a spare large capacity drive I want to put in a case and use as transportable storage, but all the cases I have looked at seem to have external power supplies with them. Is it only 2.5 drives that can get away without power supplies or can someone suggest a case for a 3.5 drive that does not require external power?

imiddleton25 · 22-09-2008, 09:50 PM

It is not possible. The 3.5" / 5.25" drives need two voltage supply: 5 V and 12 V, and the USB and Firewire bus can only supply 5 V. Furthermore the USB/Firewire bus power is limited to 500 mA (5 V)which is not enough for the 3.5"/5.25" drives

dhicks · 22-09-2008, 10:48 PM

Quote:

Originally Posted by TechSupp

can someone suggest a case for a 3.5 drive that does not require external power?

You mean a 5.25" caddy? Works well, but does require all computers you'll be using it in to have matching caddy slots.

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David Hicks

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22-09-2008, 08:25 PM	#1
TechSupp Join Date: Mar 2007 Location: South Yorkshire Posts: 224 Thanks: 19 Thanked 5 Times in 5 Posts Rep Power: 4	non external powered drive? I have a spare large capacity drive I want to put in a case and use as transportable storage, but all the cases I have looked at seem to have external power supplies with them. Is it only 2.5 drives that can get away without power supplies or can someone suggest a case for a 3.5 drive that does not require external power?

22-09-2008, 09:50 PM	#2
imiddleton25 Join Date: May 2008 Location: York Posts: 228 Thanks: 9 Thanked 13 Times in 12 Posts Rep Power: 4	No power It is not possible. The 3.5" / 5.25" drives need two voltage supply: 5 V and 12 V, and the USB and Firewire bus can only supply 5 V. Furthermore the USB/Firewire bus power is limited to 500 mA (5 V)which is not enough for the 3.5"/5.25" drives

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