On 7/31/25 13:21, Nicolas George wrote:
Eben King (HE12025-07-31):I recently got some SSDs, and decided to use one of them (a 256G model) to boot from. I want the change to be undetectable, in that from a user perspective, nothing seems different, just faster. I currently have a 2T HD, partitioned with GPT but booting by MBR. Yes, that's probably weird. When I installed Debian I was unaware that the installer would only install grub to boot using the method that the installer booted. My BIOS/firmware will boot using either method, but defaults to MBR if both methods work. You can force it to use UEFI on a one-time basis. I want the SSD to boot using UEFI. Is that possible, and if so, what's the best method to go about it?The most convenient method depends on what exactly you have right now. Can you share the output of lsblk and df?
eben@cerberus:~$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS sda 8:0 0 238.5G 0 disk └─sda1 8:1 0 238.5G 0 part sdb 8:16 0 1.8T 0 disk ├─sdb1 8:17 0 953M 0 part /boot ├─sdb2 8:18 0 2G 0 part / ├─sdb3 8:19 0 20G 0 part /usr ├─sdb5 8:21 0 953M 0 part ├─sdb6 8:22 0 300G 0 part ├─sdb7 8:23 0 30G 0 part /misc/export ├─sdb8 8:24 0 130G 0 part /misc/media ├─sdb9 8:25 0 165G 0 part /misc/mp3 ├─sdb10 8:26 0 74G 0 part /misc/torrent ├─sdb11 8:27 0 9G 0 part /home ├─sdb12 8:28 0 75G 0 part /misc/scratch └─sdb13 8:29 0 48G 0 part [SWAP] sdc 8:32 0 238.5G 0 disk ├─sdc1 8:33 0 5.1G 0 part /var/cache └─sdc2 8:34 0 182.7G 0 part /misc/iso sdd 8:48 1 0B 0 disk sr0 11:0 1 7.5G 0 rom 0 eben@cerberus:~$ df Filesystem 1K-blocks Used Available Use% Mounted on udev 16132328 0 16132328 0% /dev tmpfs 3229464 1796 3227668 1% /run /dev/sdb2 2047208 802856 1123116 42% / /dev/sdb3 20557912 8146532 11439652 42% /usr tmpfs 16147316 71380 16075936 1% /dev/shm tmpfs 5120 16 5104 1% /run/lock /dev/sdc1 5157164 1373336 3501616 29% /var/cache /dev/sdc2 187459092 79418636 98445320 45% /misc/iso /dev/sdb7 30786644 19419460 9777988 67% /misc/export /dev/sdb1 941740 132468 744096 16% /boot /dev/sdb8 133589828 122712680 4045076 97% /misc/media /dev/sdb12 76832012 43023296 29860172 60% /misc/scratch /dev/sdb9 169191044 156127788 4396124 98% /misc/mp3 /dev/sdb10 75799884 46825720 25078052 66% /misc/torrent /dev/sdb11 9278492 7747788 1042472 89% /home tmpfs 3229460 2484 3226976 1% /run/user/1000 nascent:/nfs/Media 1918708224 774040384 1125174848 41% /mnt/nascent-Media 0 eben@cerberus:~$sda is the new SSD. sdb is my HD. sdc is another SSD. nascent is a NAS. No idea what sdd is:
eben@cerberus:~$ sudo fdisk -l /dev/sdd fdisk: cannot open /dev/sdd: No medium found