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Hello!
Starting using Arch Linux a few weeks ago, and I'm enjoying it so far.
After playing around with it on a secondary tower PC, I decided to take the hard drive and put it into my main PC, so I could use it as a dual boot. I got both boots working perfectly, but I haven't figured out how to get GRUB to detect the windows partition.
Here's the output of sudo fdisk -l:
Disk /dev/sda: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: WDC WDBNCE5000P
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: 0x0a2efac0
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 1126399 1124352 549M 7 HPFS/NTFS/exFAT
/dev/sda2 1126400 975700904 974574505 464.7G 7 HPFS/NTFS/exFAT
/dev/sda3 975702016 976769023 1067008 521M 27 Hidden NTFS WinRE
Disk /dev/sdb: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: TOSHIBA DT01ACA1
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: 9FCEB65C-B499-4C23-9710-72D98358B374
Device Start End Sectors Size Type
/dev/sdb1 2048 264191 262144 128M EFI System
/dev/sdb2 264192 1953523711 1953259520 931.4G Linux filesystem
Disk /dev/sdc: 1.82 TiB, 2000398934016 bytes, 3907029168 sectors
Disk model: ST2000DM006-2DM1
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: F1AFDD51-79AD-40E1-9789-2116D477A027
Device Start End Sectors Size Type
/dev/sdc1 2048 923646 921599 450M Windows recovery environment
/dev/sdc2 923648 1128447 204800 100M EFI System
/dev/sdc3 1128448 1161215 32768 16M Microsoft reserved
/dev/sdc4 1161216 3905949173 3904787958 1.8T Microsoft basic data
/dev/sdc5 3905949696 3907024895 1075200 525M Windows recovery environment/dev/sda: My windows boot drive, (which is not being detected)
/dev/sdb: Arch Linux drive
/dev/sdc: An old windows drive, which is now storage. I haven't bothered taking windows off it which I should probably do
When I run os-prober, it recognizes the boot partition from the old disk (/dev/sdc2), but can't find the new one.
I tried installing ntfs-3g, which allowed me to mount the NTFS partition, but even after manually mounting the boot partition, os-prober still couldn't find the boot partition.
I'm fresh out of ideas, so I appreciate your help.
Thanks!
Last edited by clxxiii (2022-12-12 17:56:16)
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Try mounting the efi partition of your windows disk instead of the ntfs partition before running os-prober.
I'm assuming that sda1 is some sort of efi partition. If it is not then check if windows is installed in efi or bios mode. If windows in sda is in bios mode, then there is no way for os-prober to detect it if arch is in efi mode.
Last edited by kermit63 (2022-12-12 07:13:43)
Never argue with an idiot, they will drag you down to their level and then beat you with experience.
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I took a look and it turned out windows was installed in BIOS mode. Thankfully Windows has a pretty good tool to switch it over, I just followed this guide, and everything worked perfectly after that
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