2 USB not deliver enough power to a HDD?

[postcd]

Hello,

i have several 3,5" HDDs 5-7k rpm

and i bought this cable to externally connect HDD via USB ports:
USB 2.0 to SATA 7+15 Pin 22 Pin Adapter Cable for 2.5" inch HDD Hard Disk Drive -- BuyinCoins.com

BUT it appears it do not make spinning any of my HDD no mater which USB ports i use/combine. I tried on 2 PCs.

So i want to ask how is that possible, per USB 2.0 specification i thought i can get up to 2x500mA from 2 USB ports.

and on example one of my HDD is:
5V, 0.65A
12V, 0,6A

so i have 1,0A right, so why it do not works?

Please can i use USB splitter cable to make lets say 3-4 USB ports out of 2 USB ports of the cable i bought above mentioned?

So i would deliver lets say 4x500mA would that be enough to make HDD spinning? Thx.

 

[strollin]

You can't power a 3.5" drive from USB. The cable description even says it's for 2.5" drives. Notice that the 3.5" drive power reqs you listed ALSO shows it needs 12V in addition to 5V.

 

[cb600fshornet]

If you're buying from that website...

Something like this would do it:
USB 2.0 3.5" SATA Hard Disk Drive External Case -- BuyinCoins.com