Question: I’ve been asked to format a USB Drive with a larger Allocation Unit Size than the default. ?I’m using a Mac, Snow Leopard. ?In Disk Utility, I am unable to see anything to do with Allocation Unit Size. ?A bit of Googling suggests it might be called Cluster Size, but I can’t see anything for that, either. ?Does anyone know if it’s possible to format a drive with FAT and use a larger than default Allocation Unit Size / Cluster Size?
Answer: You should be able to do this from a command line using the newfs_msdos command. For example: ?
?
#> newfs_msdos -F 32 -V somevolumename /dev/youdiskdevice
The command takes many arguments that you may want to explore.. -c cluster-size for example.
I am sure you could google around for newfs_msdos for some usage examples and also man newfs_msdos
Hope this helps!