Paul,
Does Sys(2022,mydriveletter) help you at all?

>Hi George,
>
>Thanks for your reply.
>I'm using GetDiskFreeSpaceEx already but this doesnt
>provide the cluster size, only the free space.
>
>To reliably determine the about of disk space required
>I need to know the Cluster size.
>
>E.g. 8 files of size 1 byte each.
>With a cluster size of 32K, you would need 256K free space,
>whilst only using 8bytes of the 256K.
>
>I use GetDiskFreeSpace which provides a cluster size but
>its unreliable above 2GB partitions.
>
>Anyone got any ideas.
>
>
>Paul.