dscheck(da8): b_bcount 1024 is not on a sector boundary (ssize 4096)

[Matthew Dillon]

Interesting. The usb block device is actually reporting a sector size of
4KB.  If you want to experiment a little, try changing the BBSIZE macro in
the ntfs module from 1024 to 4096 and recompiling it.  The BBSIZE macro is
in /usr/src/sys/vfs/ntfs/ntfs.h (in DragonFlyBSD).  If you are unsure how
to just recompile one module, then just recompile the whole kernel.

I think the other block operations in ntfs are based on a block size
defined in the filesystem volume header so there's a chance that this might
solve the issue.

-Matt

On Tue, May 2, 2017 at 7:36 AM, Rod Person <rodperson at rodperson.com> wrote:

> Hi,
>
> I'm attempting to mount and external usb ntfs hard drive:
>   <Seagate Backup+  Desk 0406> Fixed Direct Access SCSI-6 device
>
> In FreeBSD I mount it using the fuse driver, but being it isn't
> available in DragonFly, I'm just attempting with mount_ntfs. I get
> Invalid argument not matter how I try and mount it. I noticed the error:
>
> dscheck(da8): b_bcount 1024 is not on a sector boundary (ssize 4096)
>
> showing up in the dmesg and once when attempting to mount in the
> console before starting X. That error doesn't show if I try and mount
> in xterm, only writes to dmesg. I assume the the sector boundary is why
> I can't mount it, but is there any way around this?
>
>
> atomizer-dfly# mount_ntfs /dev/da8 /mnt/usb
> mount_ntfs: /dev/da8: Invalid argument
>
> also tried /dev/da8s1 same result
>
> atomizer-dfly# dmesg | grep dscheck
> dscheck(da8): b_bcount 1024 is not on a sector boundary (ssize 4096)
> dscheck(da8s1): b_bcount 1024 is not on a sector boundary (ssize 4096)
>
>
> atomizer-dfly# fdisk da8s1
> ******* Working on device /dev/da8s1 *******
> parameters extracted from device are:
> cylinders=45600 heads=255 sectors/track=63 (16065 blks/cyl)
>
> Figures below won't work with BIOS for partitions not in cyl 1
> parameters to be used for BIOS calculations are:
> cylinders=45600 heads=255 sectors/track=63 (16065 blks/cyl)
>
> Media sector size is 4096
> Warning: BIOS sector numbering starts with sector 1
> Information from DOS bootblock is:
> The data for partition 1 is:
> sysid 79,(QNX 4.2 Tertiary)
>     start 1936269394, size 1836016416 (7171939 Meg), flag d
>         beg: cyl 335/ head 10/ sector 2;
>         end: cyl 327/ head 84/ sector 13
> The data for partition 2 is:
> sysid 115,(unknown)
>     start 1917848077, size 544437093 (2126707 Meg), flag 70
>         beg: cyl 371/ head 114/ sector 37;
>         end: cyl 256/ head 101/ sector 36
> The data for partition 3 is:
> sysid 43,(unknown)
>     start 1818575915, size 544175136 (2125684 Meg), flag 43
>         beg: cyl 364/ head 116/ sector 50;
>         end: cyl 372/ head 65/ sector 44
> The data for partition 4 is:
> sysid 97,(Speed)
>     start 2844524554, size 54974 (214 Meg), flag 72
>         beg: cyl 372/ head 101/ sector 51;
>         end: cyl 269/ head 114/ sector 52
> --
> Rod
>
> http://www.rodperson.com
>
> He who knows himself to be one way and pretends it is another way is a
> thief who robs his own soul.
>
>   The Mahabharata
>      Sakuntala 25
>
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