boot sector
To protect the disk and give information of what the disk contains.
It contains information about the disk or logical drive.
== == contains stored information that can be read on computer
The main PC disk that contains all information for the PC
BOOT record
Emergency Repair Disk (ERD), which contains information about your current installation. Use only as a last resort because it restores the system back to the original state after initial instalation of OS.
I do believe it is directory.
disk or hard disk
hard disk
A floppy disk DRIVE can read, erase and save information on a floppy disk. The disk can't do it by himself.
The Master Boot Record (MBR) is stored at the beginning of your hard drive (in the first 512 bytes.) The MBR contains information about the beginning and ending of each partition, which partition contains the operating system for booting, and other valuable information about the disk layout. Your computer will not boot up if your MBR is corrupt or missing.
it holds and spins information on a disk