Hello Carl,

It depends on what exactly you have purchased. It would be best to contact us directly for the best answer... It sounds to me like you had the Band-in-a-Box 2010 EverythingPAK USB hard drive? If so, and you have installed them all to that hard drive, you wouldn't need to reinstall anything after reformatting your Mac HD except for the program itself - bandinabox_2011_full.dmg


Andrew
PG Music Inc.