Accidentally wiped external hard drive?

I was on my roommates computer and was trying to do things to his usb drive to allow me to boot windows seven from it. here is what i typed in the command prompt SELECT DISK 1 CLEAN CREATE PARTITION PRIMARY SELECT PARTITION 1 ACTIVE FORMAT FS=NTFS (Format process may take few... show more I was on my roommates computer and was trying to do things to his usb drive to allow me to boot windows seven from it. here is what i typed in the command prompt
SELECT DISK 1

CLEAN

CREATE PARTITION PRIMARY

SELECT PARTITION 1

ACTIVE

FORMAT FS=NTFS

(Format process may take few seconds)

ASSIGN

EXIT
i meant that for the usb but think i used it on the drive because now his external drive is wiped. how do i get that data back if i wiped it using command prompt? thanks.
I installed pc inspector but when i click the external drive the green checkmark stays grey, so i cannot check it. please help!
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