" no disk drive was detected" during debian netinstall

hi,

i'm trying to install debain7 through USB　ｄｒｉｖｅ　on a vaio netbook (VPC-W121AX/T) with a 250GB sata hd (toshiba mk2555gsx. the netbook does not have a cdrom drive.

ｈｏｗｅｖｅｒ　ｉ　ｅｎｃｏｕｎｔｅｒｅｄ　ｅｒｒｏｒ　＇no disk drive was detected. if you know the name of the driver needed by you disk drive, you can select from the list while detect disks. if i chose 'continue with no disk drive', the systems hangs.

any help?

Switch to console Ctrl+Alt+F4 allows you to see installation errors Ctrl+Alt+F1 takes you back to the installer.

thanks for the reply!

contl-alt-f4 message are:

udevd [3977] time out: killing '/sbin/bikid -o udev -p /dev/.tmp.block-8:0'
kernel: usb 1-2: reset high-speed USB device number 2 using ehci-hcd
udevd: '/sbin/bikid -o udev -p /dev/.tmp-block-8:0', terminated by signal 9 (killed)
kernel" [sda] unhandled error code
kernel: [sda] result: hostbyte=DID_ABORT driverbyte=DRIVER=OK
kernel: [bsda] CDB: Read(10): 28 00 00 07 a7 00 00 00 08 00
kernel:  end_request: I/O error, dev sda, sector 501504
kernel: Buffer I/O error on device sda, logicl block 501504
kernel: Buffer I/O error on device sda, logicl block 501505
kernel: Buffer I/O error on device sda, logicl block 501506
kernel: Buffer I/O error on device sda, logicl block 501507
kernel: Buffer I/O error on device sda, logicl block 501508
kernel: Buffer I/O error on device sda, logicl block 501509
kernel: Buffer I/O error on device sda, logicl block 501510
kernel: Buffer I/O error on device sda, logicl block 5015011

does installer confuse the usb drive with hard disk? how to resolve this?