Geom tasting exfat slices

[Andrey V. Elsukov]

On 01.02.2014 23:45, Kevin Oberman wrote:
> I have a slice that is formatted (by Windows) as exfat. I can mount it with
> the mount.exfat-fuse command and ti seems to work fine using FUSE and
> fusefs-exfat. But geom does not see it. There is no /dev/geom directory

What do you expect to see in this directory?

> created and "gpart show" returns:
> # gpart show ada0
> =>        63  1465149105  ada0  MBR  (699G)
>           63        1985        - free -  (993K)
>         2048     2457600     1  ntfs  (1.2G)
>      2459648   958765056     2  ntfs  (457G)
>    961224704   471040000     3  ebr  (225G)
>   1432264704    32878592     4  ntfs  (16G)
>   1465143296        5872        - free -  (2.9M)
> The exfat slice is "961224704   471040000     3  ebr  (225G)"
> In more detail, I get:
> 3. Name: ada0s3
>    Mediasize: 241172480000 (225G)
>    Sectorsize: 512
>    Stripesize: 4096
>    Stripeoffset: 0
>    Mode: r0w0e0
>    rawtype: 15
>    length: 241172480000
>    offset: 492147048448
>    type: ebr
>    index: 3
>    end: 1432264703
>    start: 961224704
> More oddly, when I mount the FS, I need to mount ada0s5???
> 
> Any idea what the heck is going on? I'd really like to get it to automount
> with gnome-mount, but hald does not even seem to see it at all. I may need
> to format it differently. It shows up on Windows as a "Logical" partition,
> not "Primary". I don't understand this.

http://en.wikipedia.org/wiki/Master_boot_record

MBR provides an ability to create 4 partitions. Windows calls them
"Primary partitions". When you want to create more, you need to use EBR.

http://en.wikipedia.org/wiki/Extended_boot_record

EBR uses one entry in MBR, but can provide many "Logical partitions".
They all are inside this logical partition. Historically FreeBSD has
naming convention for these partitions - those indexes start from 5.
As you can see, your MBR used all 4 primary partitions. Those indexes
are from s1 to s4. One partition contains EBR. Name of logical
partitions inside of s3 partition starts from s5. You can see all
partitions using the command `gpart show -p ada0s3`.

-- 
WBR, Andrey V. Elsukov