My system has already a HDD and a SSD with MBR type partitions. I want to install LEAP 42.1 on a new SSD. Can I use UEFI? Do I need CSM?
Maybe you are mixing things?
The title suggests questions a bout a combination of MBR and GPT.
In the text you are talking about UEFI.
???
My current box has two disks with openSUSE 13.1 and 13.2:
erlangen:~ # fdisk -l
Disk /dev/sda: 232.9 GiB, 250059350016 bytes, 488397168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x4010395a
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 48836607 48834560 23.3G 83 Linux
/dev/sda2 48836608 64468991 15632384 7.5G 82 Linux swap / Solaris
/dev/sda3 64468992 454543359 390074368 186G 83 Linux
Disk /dev/sdb: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
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: dos
Disk identifier: 0x00018fb8
Device Boot Start End Sectors Size Id Type
/dev/sdb1 2048 104855551 104853504 50G c W95 FAT32 (LBA)
/dev/sdb2 104855552 3907028991 3802173440 1.8T f W95 Ext’d (LBA)
/dev/sdb5 * 104857600 188747775 83890176 40G 83 Linux
/dev/sdb6 188749824 3907008511 3718258688 1.7T 83 Linux
erlangen:~ #
When starting install from openSUSE-Leap-42.1-NET-x86_64.iso I got some default suggestions to reformat existing disks. I do not want to do this and need to use expert mode. As /home on SSD has already 78% disk usage I want to add a SSD anyway. Should I use MBR or GPT for the new disk?
If disk is 4Kn or exceeds 2TiB in size, you should use GPT. Otherwise whatever you are more comfortable with. Neither kernel nor bootloader really care.
Thanks to both of you for the reply. I had a closer look at the boot devices offered by UEFI. I found that the DVD Recorder has two entries: One using UEFI and another using CSM (Compatibility Support Module). Switching from the former to the latter I am now fine with the proposal made by the installer. Reading in the old system’s mount points now works fine.
UEFI settings now are: CSM enabled, Secure boot disabled. Boot of installer is from legacy DVD Recorder.