badblocks on linux usb

i am facing a badblocks problem on my usb external drive i use usb cheap sata casing how can i check them on usb as smart(disk utility) is not working on usb drives

also what could be cause of bad sectors can cheap casing cause bad sectors i wonder

 

SMART data requires that the device reports it
So you need a different method to check. Probably byte-by-byte read/write.
Mrk

 

i tried that on windows it show ok in short generic test

i run long soon after i backup all data

http://www.seagate.com/ww/v/index.j...toid=720bd20cacdec010VgnVCM100000dd04090aRCRD


http://support.seagate.com/rightnow/Flash/seatools/SeaToolsforWindows_Warranty.html


i guess it work any other tools mrk may you recomend for windows or linux which are safe to use

 

Mack, silly question but how did you know that you had bad blocks?

 

no its not silly question but very right question its my fault i should Ans that before

i connected a cheap casing with USB and inside it i connect sata harddisk althoe it work perfectly before now on linux mint 12 i notice 2 times hanging and giving me error in Cli mode badblock occur thats make me worried