reiserfs_create: no enough blocks on device

Hi,
I am trying to create a reiserfs filesystem using the command
'mkreiserfs /dev/loop/0 5000'.
It always gives me the error "reiserfs_create: no enough blocks on device".

I tried altering the block size, but it would not
help..
Pls help with any tips...

thx in advance
Sankarshana M

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