Finding remaining space in upload module

Hi All,

       I have come up with one doubt . for example if 100 users are

uploading 1GB file concurrently .and i have only 50GB

free space in my hard Disk.here i dont want to allow after 50 users
started to upload file.i want to restrict users who comes after 50 and
i want tell the users nomemory to allocate .if i can do that? How can i
do that?.is there any 3rd party module to handle it or do i have to
enable any module?

Thanks

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