Hi all, i’d been using a My Book Studio II (2 TB) external drive for about 4 years, connected to my iMac through FireWire 800. Lately, the hard disks started having issues, and seeing that newer My Book models don’t have FireWire connectivity, i thought i’d just replace the drives inside. So i bought what i thought were identical HDDs, replaced the old ones inside the case, but when connected, my iMac doesn’t see them/it… The case lights up, and then the top and bottom lights start flashing every second.
I’ve checked this on other computers (mac and pc), same thing.
The hard disks do work if put in other cases, they just won’t work in the My Book Studio II case (and i’m sure there’s no problem with the case itself, if i put the old hard disks inside, my mac sees it and everything works as it’s supposed to).
So now i’m stuck. Is there something else i should do that i’m missing? Or did i get the wrong HDDs? The only difference that i see between the old ones and the new ones is the cache size (32MB the old, 64MB the new ones). Could that be the problem? I can’t find the older models anymore… 
Help…
