BIOS
- BIOS(Basic Input Output System)
- Firmware: The ROM(Read-Only Memory) content
- The bios identifies input/output devices
The bios reads the first 512 first octets from each storage devices to identify the bootable disks
Bios uses MBR Partitioning
UEFI
- UEFI(Unified Extensible Firmware Interface)
- Bootable devices limited to 2.2 TB
- Hybride motherboard
- Secure boot
Uses MBR and GPT Partitioning
MBR
- Master boot record
- MBR is the name for the first sectors (512 octets)
- Contains the partition table
- Limitations : maximum 4 partitions that are limited to 2.2 TB
GPT
- GPT Partitioning table GUID :Globally Unique Identifier Partition Table
- Limitations: 128 partitions per disk, 256 TB per partitions, compatible with a limited number of OS’s