Use WIN7PE SE disk on more then one pc

Hi
I build  the  project WIN7PE  SE    using the default setting and include the DriveImage XML  script  .I  used it to  create a backup to my PC and it work OK  I use an external use HD for the backup . When I try to use the some  disk I can not see the external HD in the disk available  . what is the problem ? both PC are WIN7
Regards Doron

Some ideas:
1)
Check a case with "Disk Manager" to see if disk available ? (but missing letter ;) )

2)
maybe usb3 driver  ?!
Win7 does not support usb3 natively. (Win8 does  )
"Drivers\USB 3.0 Support" plugin available, it can make things work nice.

3)
"Drivers\Driver Integration" plugin available, where you can integrate driver packs etc.

4)
If "usb disk" requires a special integration (special driver) you need to find a way to integrate.

5)
who knows, maybe something else, let us know.

Hi
I tried to  reset again the option and new build and now it is OK  ( the problem was that  for some reason i could use the build DVD  only on the  PC used for the build and   did not see  other  external disk used  for backup on other PC )
regards Doron