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VMware Player uses a "2GB Sparse" file format by default, which divides the VM's virtual disk into slices. In previous versions the maximum size of a slice was 2GB, with newer versions the size of a single file depends on the virtual disk's provisioned size. If you want you can create monolithic virtual disk files, i.e. a single .vmdk file. However, the 2GB sparse format has several advantages, like increasing the virtual disk size doesn't require a full copy (i.e. time and disk temporary space) ...
André