The Hitachi cable will only work with a Hitachi ZIF drive. It is thicker than the Toshiba ZIF drive socket. And yes, you are looking for a 1.8 inch ZIF hard drive. You will either get a 32 or 64GB drive. I don't know if Hitachi makes anything larger than 64 GB. They might have an 80 GB drive. Getting anything bigger, while technically should work, several people trying to go bigger have shared their woes on this forum. You can read their stories and decide if you want to try. Finally, the restore disks can sometimes be found on ebay. However, I have only found the LE version of the OS restore disk offering Windows XP. Motion went away from offering restore disks and had a factory image on the hard drive using Acronis True Image. So you should be able to find an XP disk but not an LE 1700 OS disk for Vista or Windows 7. Also, the drivers are all on the Motion website. Good luck and welcome to the forum.
Current: TX2525nr, iPad (yes, even the iPad).
Former: Motion Computing LE1700, 1400 and 1300, TC1100, P1510