So before one week one of my external hard drive ( a maxell tank 1 TB with a toshiba sata3 hdd drivestarted to fail so i recovered the bad sectors with hdd regenerator bought a new hard drive(wd10ezex) and transfered all the data from one hdd to the other. Because my computer use sata 1 with a vt 8237 its don't recognize sata 3 drives even with jumpers so i had to use the external case of another wd drive to plug the wd10ezex in one usb port and after plug the toshiba in its original case. And my problem started today when i removed the toshiba that is bad from the maxell case and plugged the wd10ezex on it windows xp recognized it as removable storage and the drive was not accessible even in the device manager the drive was not recognized as my western digital wd10ezex but as a removable usb drive on the hard drive section. So i removed it from the maxell tank case and put it on the other wd digital case that i did do the original transfer of my data and the wd10ezex was seen normally without problems. Why this happen and if plan to buy a direct attached storage is my wd will be recognized normaly