I registered just so I could point out, that
If you've verified all you're wiring is correct.. And your head unit is compatable.. And you are suffering from the following problems :
No Sound
Slow Access
Unit Not being recoginized
One unit not working when you daisy chain them together
They can usually be solved by doing a CPU reset on your head unit.. Usually a small hole on the front of your faceplate...
I have the Sirrus and the USB Pbus addon daisy chained together.. And they both worth pefectly fine together.. You just have to play with it and pray to the car gods..
BTW, I am using a 40 gig hard drive on my USB port..
AND if you want to format a larger drive into a 32 MB Fat32 partition.. Just do the following
Control Panel > Administrative Tools > Computer Management > Disk Management
Choose the Portal HD
Right click and select "Delete Partition"
Rick click on it again and select "Create Partition"
Enter 32 GB for the size
Format Said Partition with Fat32
Let it format

All done!
Sure you'll be wasting whatever you have past 32 gigs.. But thats the price
GL!
-M
Good Luck
