August 29, 2025Aug 29 Hi, Had the same issue as described here: https://forums.unraid.net/topic/190454-upgraded-to-712-and-two-of-my-drives-unmountable-solved/It only concerned one external SSD I ran as backup.I ran the command sgdisk -g -o -a 8 -n 1:32K:0 /dev/sdb but the array was running... Rebooted and lost the whole server, it won't boot, show shares on network, web UI, SSH, nothing... Have I just lost it all?
August 29, 2025Aug 29 Community Expert Are you sure sdb wasn't the boot device? Do you have a current flash backup?
August 29, 2025Aug 29 Author Pretty sure it wasn't, here is the config, the drive that had issues was 'backup' Flash disk is sda and wasn't removed. I flashed the old backup disk, installed Unraid and booted from it. Now able to check the drives, config, etc, not sure how I could re-establish/correct boot process from now on though
August 29, 2025Aug 29 Author How can I set sdb as boot partition? sda is current temporary unraid installer. sdb is original Flash Drive partition but I can't find anything on it.Tried to check fstab but nothing of interest. Edited August 29, 2025Aug 29 by kzfdjbzf
August 29, 2025Aug 29 Author Ok so I set up the array again and I have 5 disks showing as unmountable... :/ I'd like to retrieve sdb as it's the previous flash drive. fdisk -l /dev/sdbfdisk -l /dev/sdbDisk /dev/sdb: 3.75 GiB, 4026531840 bytes, 7864320 sectorsDisk model: Flash Disk Units: sectors of 1 * 512 = 512 bytesSector size (logical/physical): 512 bytes / 512 bytesI/O size (minimum/optimal): 512 bytes / 512 bytesDisklabel type: gptDisk identifier: 319E168E-53D4-42BB-B677-7E2F16E822D0Device Start End Sectors Size Type/dev/sdb1 64 7864286 7864223 3.7G Linux filesystem
August 29, 2025Aug 29 Community Expert I am confused - sdb in your screenshot is not a1 hour ago, kzfdjbzf said:How can I set sdb as boot partition?What do you want to boot from there? Unraid always boots from a flash drive, and that flash drive needs to be present all the time Unraid is running.1 hour ago, kzfdjbzf said:sda is current temporary unraid installer.Unraid does not have an 'installer'. Device sda is the current Unraid boot device. 1 hour ago, kzfdjbzf said:sdb is original Flash Drive partition but I can't find anything on it.Do not understand this statement at all?Your fdisk shows that sdb is partitioned with a Linux file system whereas sda (the boot drive) has a FAT32 file system.
August 29, 2025Aug 29 Community Expert Please don't blindly run commands you've found on other posts; it may be a similar symptom but caused by an entirely different problem. The command you ran is most likely wrong for an SSD, start by posting the diagnostics.
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