So back when I used WUBI before settling on using a VM, GRUB was installed (but I messed it up and had to reinstall everything (luckily I backed up)). That was back when I used Vista which starts at LBA 63. Since then, I have switched to Se7en which starts at LBA 2048. I have examined the MBR partition table and determined that on both of them.
Also, I have BOOTMGR on sector 63 on the Vista original disk, but my new disk I recently got has BOOTMGR on 2048. So my question is can I wipe this area of the disk with nulls? Yes I understand that it has to chance to go horribly wrong, but I have an OCD on this (GET OVER IT) and seeing the nulls on drive 2 has made it worse.
Here is the MBR of the disks. The second one isn't a boot drive
HDD1: 00 01 01 00 12 FE FF FF 3F 00 00 00 3B 4C 38 01 ; Hidden boot part 80 FE FF FF 07 FE FF FF 00 50 38 01 00 90 0A 24 ; Data HDD2: 00 20 21 00 07 FE FF FF 00 08 00 00 00 48 38 3A ; Data + Backup
LBA 2 on original disk showing unwiped GRUB data
LBA 2047-2048 on 8 month old disk