iTunes sync logic

[whoachubby]

I have an iPad and Itouch.

Having never downloaded any video I thought I would do a test on my touch.
Went into iTunes store and downloaded a tv show into iTunes.

Then I went to iTunes and hit the tv button. Saw the downloaded show and checked the boxes.

When I hit sync I got a message that said iTunes would erase all of my videos and music if I proceeded. I hit sync and it downloaded the tv show and true to it's word it erased all of my music from the I touch.
What possible logic is at play here. How can you sync video from iTunes if this is the result?

 

[ipadfanatic]

I think what you did was try to sync your itouch to iTunes that is already linked to your iPad (or another device). For example there are two iPad is my house (my wife's and then mine).

I order to sync both iPads without erasing what's on them I had to create a different Windows Login account. When I sync mine I log in as myself. When she synces her then she uses her login. This has always been the case with iTunes (and its downfall).

 

[whoachubby]

That makes sense.

How can I tell which device it is linked with?

 

[whoachubby]

That makes sense.

How can I tell which device it is linked with?

 

[Bass656]

I am not sure of the logic as to why it occurred, but I am pretty sure that it has nothing to do only being able to link one device to ITunes at a time. I have an IPhone 4, an IPad, 2 ITouches and a older click wheel IPod synced to my single log-in account in ITunes