I've got a "Travel Star" USB HDD enclosure (NOT Hitachi!), and the driver supplied is for GL 811 chipset. It did not work. I used D G Tool Kit and found the supplier to be Prolific Technologies. Got this driver from their website, worked perfectly first time. I recommend Tool Kit!
The following files are found inside the driver download file.
|PL2507_Disk_Remove_Generic_1700.exe||2.2 MB||29 Aug 2006|
|readme.txt||2.1 KB||31 Aug 2006|