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

[Matthew Dillon]

I've never seen a regular usb stick report a 4KB logical sector size.  I
can see an external hard drive connected via usb potentially reporting it
because there's usually a usb/sata mux chip in those devices, and sometimes
they even use a RAID mux in a degenerate configuration which might report a
4KB logical sector size (even if the HDD is 512 logical / 4KB physical).
But I've never seen a normal usb stick report a 4KB logical sector size.

-Matt

On Tue, May 2, 2017 at 9:38 AM, Tomohiro Kusumi <kusumi.tomohiro at gmail.com>
wrote:

> You can see this with other fs too.
> I saw this with ext2 (I mean ext2 on dfly) on usb stick.
>
> 2017-05-02 19:23 GMT+03:00 Matthew Dillon <dillon at backplane.com>:
> > 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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