mobile rack in external case

i bought an external firewire case with 2 bays and 2 mobile racks, so i can use my dvdrom and two harddisks (swapping them).
could be nice, but doesnt work :/
without mobile racks, harddisk and dvdrom works fine.
with mobile rack, i cannot write on the disks.
tested disks with mobile rack in another computer and it worked fine.
os is osx

any ideas?

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