No. The device driver cannot address the area above the 4GB limit, no matter how big the partitions are.
And even worse, you are able to create partitions above the 4GB limit, but if you try to access them, the accesses are wrapped around to the lower 4GB. So if you write to a partition above the 4GB limit, you will overwrite data below the limit, probably destroying important data, at least corrupting part of the data.
The problem is a 32bit interface between the device driver (usually called scsi.device) and the filesystem (FastFileSystem) or low-level application program (Format, DiskSalv, ReOrg, PC-Task, ShapeShifter etc.).
What you need to do to access above the 4GB limit is to replace both, the device driver and the program talking to it, by a version which can use 64bit commands. The device driver can be replaced by OS3.9 or IDEfix and the file system can be replaced either by the new FastFileSystem coming with OS3.9 or by PFS3 or SFS. There are no replacements for programs like DiskSalv etc. as mentioned above, so beware of using them on partitions above the 4GB limit.
AFAIK both IDEfix and OS3.9 need Kickstart 3.1 and more memory, so no way to use them on a stock A600.
Bye,
Thomas