Unable to mount FAT16 partition (Invalid Argument)

[Amit Yaron]

Try mounting an MS-DOS file sytem as follows:

mount -t msdosfs <etc.>.

On 25.3.2019 3:42, Peter Erickson wrote:
> I'm hoping to get some assistance mounting a FAT (FAT16?) partition 
> created by the VMware ESXi installer (version 6.7.0). Every attempt to 
> mount it on 11.2-RELEASE-p4, results in an "Invalid argument" error, 
> without much to indicate what is wrong or how to resolve it. Any advice 
> or direction would be much appreciated.
> 
> # gpart show ada1
> =>      34  16777149  ada1  GPT  (8.0G)
>          34        30        - free -  (15K)
>          64      8128     1  efi  (4.0M)
>        8192        32        - free -  (16K)
>        8224    511968     5  ms-basic-data  (250M)
>      520192        32        - free -  (16K)
>      520224    511968     6  ms-basic-data  (250M)
>     1032192        32        - free -  (16K)
>     1032224    225248     7  vmware-vmkdiag  (110M)
>     1257472        32        - free -  (16K)
>     1257504    585696     8  ms-basic-data  (286M)
>     1843200   8386560     2  ms-basic-data  (4.0G)
>    10229760   6547423     3  vmware-vmfs  (3.1G)
> 
> # ls /dev/ada1*
> /dev/ada1        /dev/ada1p2     /dev/ada1p5     /dev/ada1p7
> /dev/ada1p1      /dev/ada1p3     /dev/ada1p6     /dev/ada1p8
> 
> # file -s /dev/ada1p5
> /dev/ada1p5: DOS/MBR boot sector, code offset 0x3c+2, OEM-ID "MSDOS5.0", 
> sectors/cluster 8, reserved sectors 2, root entries 512, Media 
> descriptor 0xf8, sectors/FAT 250, sectors/track 32, heads 64, sectors 
> 511968 (volumes > 32 MB), serial number 0x4e781016, label: " ", FAT (16 
> bit)
> 
> # mount -t msdosfs /dev/ada1p5 /mnt
> mount_msdosfs: /dev/ada1p5: Invalid argument
> 
> While this isn't the drive I initially had the problem with, I have been 
> able to recreate it using VirtualBox.
> 
> # dmesg | grep ada1
> ada1 at ata0 bus 0 scbus0 target 1 lun 0
> ada1: <VBOX HARDDISK 1.0> ATA-6 device
> ada1: Serial Number VB039c38ca-974cc97c
> ada1: 33.300MB/s transfers (UDMA2, PIO 65536bytes)
> ada1: 8192MB (16777216 512 byte sectors)
> 
> FWIW, knoppix has no issues mounting the partition, but I'd really be 
> interested in getting this to work on FreeBSD.
> 
> knoppix # mount | grep /dev/sdb5
> /dev/sdb5 on /mnt type vfat 
> (rw,relatime,fmask=0022,dmask=0022,codepage=850,iocharset=utf8,shortname=mixed,errors=remount-ro) 
> 
> 
> Based on the info from knoppix, I tried to mount the partition under 
> FreeBSD using mount_msdosfs directly and specifying the locale 
> (en_US.UTF-8) and codepage (CP850) , but the result was the same - 
> "Invalid argument."
> 
> Thanks in advance.
> 
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