This is a double question, I just hope it's valid.
I need to know how to use dd to make splitted ISO images from some storage device, I'm doing it through SSH: the process is slow and the risk of faling at the mid of the operation (1) is high then I need to know how to make these splitted ISO images from my storage device (2) and also how to merge all the pieces after the process.
I'm searching for some reference on dd, it could be a book or a good website about it for when any doubt arises.
1 - I'm doing it on a ~60GB storage device, it took me a whole day to copy ~10GB from this disk.
2 - For curious people, I'm trying to recover an accidentaly deleted file from an iPod, until now I've been able to make the whole process, I just need to improve it beucase I left it copying the disk yesterday: Today it gave me an error when it was at ~10GB.