No, not unless you reformat like 80X or more in a period of one week! (who does this?) Actually, since harddrives use magnetics, unless the magnetic charge dies (massive shock or demag field) then it is fine. The reason is that a HD uses a magnetic read/write head to transmit info onto and off the HD. A magnetized area is read as a 1 while an unmagnitized area is read as a 0, thus making binary. When you reformat, you simply "demagnitize that area" of the harddrive, and effectively clear the code. All zeros are read as nothing except free space if they have no ones to fill in with them. SO when you partially demag by formatting, you run a very low risk of HD corruption. Hope this helps.