A boot-sector infector virus places its starting code in the boot sector. When the computer tries to read and execute the programme in the boot sector, the virus goes into memory where it can gain control over basic computer operations. From memory, a boot-sector infector can spread to other drives (floppy, network, etc. ) on the system. Once the virus is running, it usually executes the normal boot program, which it stores elsewhere on the disk. It is also called a boot virus, boot-sector virus, or BSI.