3.11 Combination of the BIOS Legacy/UEFI booting and MBR/GPT

💡 Some confusing concepts

• Disk Partitions system: MBR, GPT
• File system: FAT32, NTFS, ext2/3/4, exFAT
• Booting system: BIOS Legacy, UEFI

💡 Combo summary

BIOS Legacy ❤️ MBR ❤️ 32bits OS

• Legacy is like a shy teacher
• MBR Disk, 3P + U || 4P || 3P + E(xL) || 3P + E(xL + U), 2TB total

❓ Why?

• bc legacy can only read four partitons

✔️ Legacy wants 32 bits OS

• bc 32 bits OS is not too demanding
• low power

BIOS UEFI ❤️ GPT ❤️ 64 bits OS

• UEFI: I have super powers for booting
• I want to challenge muself w GPT
• GPT 127P + U || 128P

❓ Why?

• bc UEFI can boot until up to 128P

✔️ Legacy wants 64 bits OS

• want 64 bits OS, can deal with more deamnds

🤝 Compatibility

✔️ Perfect couples

• BIOS ❤️ MBR ❤️ 32b
• UEFI ❤️ GPT ❤️ 64bit

✔️ Some compatibilities

• UEFI 🤝 MBR
• BIOS 🤝 GPT(but only the 4 first partitions, thanks to MBR protective index) ❤️ 32b

✔️ For windows Windows >= Vista or numbered windows

• like windows vista, windows 7, 8, 9, 10 ,11...

• If you are Windows >= Vista or numbered windows and want to use 64bits
• UEFI and GPT and 64bits is mandatory

❓ If you have a windows xP and you want 64 bits
it could work with MBR and Legacy?
- well, maybe

❓ If you have a windows 10 and you want 64 bits
it could work with MBR and Legacy?
- NO!
- UEFI and GPT and 64bits is mandatory

❓ Sohee has an MBR disk, UEFI with a Windows 10 32 bits.
Her boss wants her to swap into Windows 10 of 64 bits.
Can she do this?

- NO!
- UEFI, GPT is mandatory for 64 bits for windows vista or numbered editions

Then, what should she do?
- UEFI can stay
- but convert MBR into GPT

❓ Can we convert MBR into GPT?
- can we place 4 students in a classroom with 128 seats?
- Yes, we can convert MBR into GPT

❓ Can we convert GPT into MBR?
- can we place 128 students in a classroom with 4 seats?
- Np, we cannot convert the GPT into MBR

✅ How to convert MBR into GPT

✔️ Importance of backup

• when converting from MBR to GPT,
• the computer tries to keep the information
• however, for just in case
• make a backup!

1️⃣ Use command mbr2gpt

Win + R > cmd > mbr2gpt

✔️ What happens if you are converting from MBR to GPT, it fails?

• the whole process will fail

✔️ This command has two steps

• (1) /validate
• validate if the convertion is possible,

• before really doing it

• (2) /convert

• actually does the conversion

• /disk/(number of disk)
• and apart from the steps
• we have to indicate which is the disk we want to convert
• command: /disk/(number of disk)

• ⚠️ need to mention the disk number ⭕️, not the disk letter ❌!

  • for internal disk: number 0
  • for external disk: number 1, 2, 3…
  • 👀 /disk/0, /disk/1
• 👎🏻 very risky, maybe you mistakenly put a wrong number
• and you end up losing all information in a disk you didnt want to touch

✔️ Then followed by…

• /allowFullOS
• the OS in the GPT disk will be in the same order as the MBR
• very important, if you change the order of OS
• you can change the order of the booting

✔️ Summary of the whole command

• [ ] indicate the real number, change into your number

2️⃣ EaseUs

• a visual application
• has option convertir MBR en GPT
• just click and you can convert

3️⃣ MiniTool Partition Wizard

• also a visual application
• click on convert MBR Disk to GPT Disk
• this application is also good for placing the Unallocated space inside the umbrella

4️⃣ AOMEI

• also a visual application
• click on convert to GPT

• but you have to pay

• also good for creating OS To Go
• OS To Go: OS live
• OS live: OS that you can use wo installing

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⭐️⭐️⭐️ EXAM ⭐️⭐️⭐️
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