It is possible to save a sequence and all its sounds to the MPC disk, then erase the sequence and its sounds from the hard drive and still be able to load it from the disk?
there is no such thing as a hard drive in the mpc.
the mpc runs off of ram, which means that you have to save your sounds to a floppy/zip disk every time that you power down your mpc if you want to hear your beat ever again.