Thank you Samuel.
> I bought a 5T external hard drive and tried to install Debian 12 on it
> manually. But I could NOT set up the /root partition as bootable, and the
> installation program did NOT allow me to set up each partition in EXT4 format.
>
> The partition table I set up is:
>
> /dev/sda1 1k unused (it was created automatically)
> /dev/sda2 500M EFI System Partition (ESP):formatted as FAT32
> /dev/sda3 20G /root formatted as EXT4, but I could NOT set it as bootable
> /dev/sda4 40G /home formatted as EXT4
> /dev/sda5 1G formatted as SWAP
> /dev/sda6 4.5T /data formatted as EXT4
> /dev/sda7 256K unused
>
> The sudo fdisk -l result is:
>
> Disk /dev/sda: 4.55 TiB, 5000981077504 bytes, 9767541167 sectors
> Disk model: One Touch w/PW
> Units: sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 4096 bytes
> I/O size (minimum/optimal): 4096 bytes / 4096 bytes
> Disklabel type: gpt
> Disk identifier: 464295B6-9A0B-4A04-B689-AFE30DFF573C
>
> Device Start End Sectors Size Type
> /dev/sda1 2048 1026047 1024000 500M EFI System
> /dev/sda2 1026048 63940607 62914560 30G Linux filesystem
> /dev/sda3 63940608 189769727 125829120 60G Linux filesystem
> /dev/sda4 189769728 193964031 4194304 2G Linux filesystem
> /dev/sda5 193964032 9767540735 9573576704 4.5T Linux filesystem
>
Please tell me how to install correctly. THanks.
Regards
Henry