diff between Ipods "models"

[Nacho-RT74]

I have found for example M450LL/A and MA450LL/A 

[Arthu®]

Can I ask you why you would want to know? Really it is of no significance in normal use. There is probably some different/updated resistor or something small in it that is an update of the generation. Unless you are going to mod it I wouldn't worry about it. I know you are an audio guy, but as far as I know an iMod costs like 250USD and even they don't make a difference in model numbers. Do you plan on hacking it yourself?

Btw have you contacted Apple?

Arthur (Proud owner of a MA450LL/A)

[Nacho-RT74]

not really big headache. I was thinking on maybe because it could be a accesories diff on package . or maybe a gen diff too ( M first 5th gen and then 5.5 gen on MAs models )

Ipod website ( mac store ) doesn't state anything about numbers models.

Anyway, is not for me, is for a friend of mine that I'm helping to get one through my ebay account. I'm a M:robe proud owner