Splitting large files into external FAT32 HD

[Tito]

Hello people:
[snip] I do have space in the external HD (sda1 partition) so my question is if there is any simple modification of the split command

split -b 1000m filename filename

to put the split pieces into sda1 rather than hda1. I also want to join the pieces in the sda1 partition before connecting the external HD to another computer that will receive the container.

cat filenamead >> filenameaa

So how do i identify the sda1 partition in the cat command?
Thanks for your help.
Tito

With split, split -b 1000m filename /mnt/sda1/filename

basicly the same for cat.

Thanks. In the external HD i have a little less than 8 GB so to rejoin
the parts into the whole container, which is 4GB, i need to delete the parts as they are being assembled. How do i modify the cat command to do just that?
Tito
joined