welcome to the forums...
to set the os back to factory settings press and hold the erase key till the mpc has booted to the main screen.
to erase the harddisk goto either the load or save screen and then choose utility - there you will find the option to format the hdd.
you can also format the drive (or any inserted compact flash-card) from your computer thru the usb connection, but it is recommended to use the internal format because the mpc can be a little picky when you format it from the outside.
at first i would check if there is any folder or the internal memory is set to autoload and just turn that of or point it to another folder of you choice. that way you can keep the factory delivered sounds. maybe you want to use them later, even if it is just to explore the mpc. the factory sounds can be also downloaded later, but be advised that there are different iterations of the stock sounds, depending on whether your mpc shiped with a 32 or 128mb compact flash card.
also the mpc os is not on the harddrive but in the internal memory. to check the version hit mode-> pad10. latest official version is os 1.24. if your main srceen looks different than in the manual check double and triple before you do anything, because the previous owner might have installed the third party jj os which comes in different versions. some of them cost a lot of money! if you find this check the other forum here for the alternative os.
peace, jo
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