Comment by ableal

I downloaded the first couple dozen megabytes. It's all nulls.

    $ od 500megabytefile.tar.gz 
    0000000 000000 000000 000000 000000 000000 000000 000000 000000
    *
    27200000

(besides not being a .tar.gz, it's not 500 MB either, it's 512 000 000 bytes = 512 MB, or 488 MiB)