Re: Error: Unknown Filesystem

[Randy Decker]

Petro,

I am not skilled in grub but noticed what appears to be a missing "(" and two 
listings of (hd1,gpt1) in the response to grub rescue> ls.  See below.
Randy

-----Original Message-----
>From: Petro <address@hidden>
>Sent: Oct 27, 2012 5:08 AM
>To: address@hidden
>Subject: Error: Unknown Filesystem
>
>I'm clearly doing something very stupid here and just *not* seeing my 
>mistake.
>
>I've read through the documentation on www.gnu.org/software/grub/ and a 
>few other places, and I'm just not seeing my mistake.
>
>I am trying to create a "multiboot" usb installer like this gent here:
>  http://www.panticz.de/MultiBootUSB
>
>But I've found similar instructions in other places.
>
>The one difference is that I can't use vfat/fat32 as I need, or at least 
>want to use ISOs that are larger than that would allow.
>
>I run parted, and create 2 partitions thusly:
>
>address@hidden ~]# parted /dev/sdb
>GNU Parted 3.0
>Using /dev/sdb
>Welcome to GNU Parted! Type 'help' to view a list of commands.
>(parted) print
>Model: A-DATA USB Flash Drive (scsi)
>Disk /dev/sdb: 16.2GB
>Sector size (logical/physical): 512B/512B
>Partition Table: gpt
>
>Number  Start   End     Size    File system  Name  Flags
>  1      1049kB  200MB   199MB                boot  bios_grub
>  2      200MB   16.2GB  16.0GB  ext3         data
>
>Then I mkfs.vfat as such:
>address@hidden ~]# mkfs.vfat -n "multiboottest" /dev/sdb1
>mkfs.vfat 3.0.12 (29 Oct 2011)
>
>Mount it:
>address@hidden ~]# mount /dev/sdb1 /mnt/1/
>
>Run grub install (I had to compile grub2 meself as I'm using Scientific 
>Linux 6.3 in a VM and Fedora Core on the physical machine. Oh, wait. 
>Fedora Core is at 1.99. Let's try those bits...
>No difference.
>
>Anyway:
>address@hidden ~]# /opt/grub2/sbin/grub-install --no-floppy 
>--root-directory=/mnt/1 /dev/sdb
>Installation finished. No error reported.
>
>address@hidden ~]# umount /dev/sdb1
>
>address@hidden ~]# mount /dev/sdb1 /mnt/1/
>mount: you must specify the filesystem type
>
>Uh.... Huh.
>
>So I stick the USB key in the lapdog and reboot.
>
>GRUB loading.
>Welcome to GRUB!
>
>error: unknown filesystem.
>Entering rescue mode...
>grub rescue>
>
>grub rescue> ls
>(hd0) (hd0,gpt2) (hd0,gpt1) (hd1) hd1,gpt1) (hd1,gpt3) (hd1,gpt2) (hd1,gpt1)
There seems to be a "(" missing here. Should this be:
(hd0) (hd0,gpt2) (hd0,gpt1) (hd1) (hd1,gpt3) (hd1,gpt2) (hd1,gpt1)
>
>grub rescue> set
>prefix=(hd0,gpt1)/boot/grub2
>root=hd0,gpt1
>
>I get similar behavior if I use a ~250GIB WD USB drive.
>
>What am I messing up?
>
>Thanks,
>Petro.
>address@hidden address@hidden
>:wq
>
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