joining and extracting archive

Hello,
if I have tar.gz archive divided into severeal pieces with split and put
each on floppy disk, then I can use this command:

( while mount -o ro -t vfat /dev/fd0 /fl; do cat /fl/x*;
echo -n 'Insert next' >&2; umount /fl; read; done ) | gzip -d | tar -xf -

on my "big" distribution to unpack it on-the-fly (without creating
big temporary file by joining all pieces together).

But it doesn't work on tomsrtbt - after inserting second floppy and
pressing a key I got this error:

Segmentation fault
gzip: invalid compressed data--format violated
gzip: invalid compressed data--crc error
gzip: invalid compressed data--length error
tar: Ready for volume 2
tar: Type "go" when ready to proceed (or "quit" to abort):


Is there a way how to unpack this files without joining them somewhere?
(I plan to use it with cd-roms, and on the target harddisk probably won't be
enough space to join the files)

Thanks
BzF