In attach fdisk with debug information. Please try it and provide dump
file, e.g
# dumper -d /tmp &
# fdisk /dev/usb0 show
The fdisk.dmp file should appear in /tmp/ after SIGFPE.
It seems that driver provides incorrect geometry and it will be
interesting to look what fdisk receives.
Also provide sin ar, sin info, sin ir, usb -vvv output.

Try csw_ignore option:
# Fsys.umass umass csw_ignore

Regards,
Pavel

> QNX 4.25 installed with 2011 Release.
> Installed USB Stack V2.00K (tho I had the same issues below, before this patch).
>
> I connect a USB hard drive (one a 2TB G-Tech, SATA I believe; the other an old 20gb PATA IDE via IDE-to-USB adapter).
> I've connected both a flash drive and a CF Reader to two ports, and they were seen - but I don't remember now if I was
 able to access files.
> Run io-usb &
> Get /dev/usb
>
> Run usb -vvv
> The device (either) is recognized.
> ****************************
> USB 0 (UHCI) v1.10, v1.01 DDK, v1.01 HCD
>     Control, Interrupt, Bulk, Isoch, Low speed
>
> Device Address             : 1
> Upstream Host Controller   : 0
> Upstream Device Address    : 0
> Upstream Port              : 0
> Upstream Port Speed        : Full
> Vendor                     : 0x4971 (G-TECH)
> Product                    : 0xce33 (G-DRIVE)
> Device Release             : r2.05
> USB Spec Release           : v2.00
> Serial Number              : EB42009V
> Class                      : 0x00 (Independant per interface)
> Max PacketSize0            : 64
> Languages                  : 0x0409 (English), 0x041a
> Current Frame              : 542 (1024 bytes)
> Configurations             : 1
>   Configuration            : 1 (Config0)
>     Attributes             : 0xc0 (Self-powered)
>     Max Power              : 0 mA
>     Interfaces             : 1
>       Interface            : 0 / 0 (Interface0)
>         Class              : 0x08 (Mass Storage)
>         Subclass           : 0x06 (SCSI)
>         Protocol           : 0x50
>         Endpoints          : Control + 2
>           Endpoint         : 0
>             Attributes     : Control
>             Max Packet Size: 64
>           Endpoint         : 1
>             Attributes     : Bulk/OUT
>             Max Packet Size: 64
>           Endpoint         : 1
>             Attributes     : Bulk/IN
>             Max Packet Size: 64
> ************************************
>
> run Fsys.umass fsys
> Get Path=0 - QNX USB Storage
> target=0 lun=0 Direct-Access(0) - Ext Hard  Disk Rev:
>
> Get hd0 added to /dev/.
>
> If I run just 'Fsys.umass' after io-usb...
> Get [000] SIM="" HBA="QNX USB Storage"
> [00,0,0] type=00 ver-05 resp=02 flags=00 Ext Hard Disk
>
> Nothing new is added to /dev/.
> (nor to /dos/ - I checked just in case)
>
> Run Fsys.umass -v fsys -N usb -n usb0 &
> I get the /dev/usb0
>
> But if I try to fdisk either usb0 or hd0 device (fdisk /dev/usb0 delete, add, show, info) - 
> I get: //1/bin/fdisk terminated (SIGFPE ) at 0007:0000xxxx
> %2       xxx Floating exception    fdisk /dev/usb0 show "Floating exception"
>
> I also tried:
> Fsys.umass -l -n Direct-Access=hd
> and other combinations I've found online - most don't create any new device.
>
> Dinit won't work as Block 1 not found ("not formatted?").
>
> Both hard drives work fine on a Windows XP station.
> I deleted the NTFS partition on the 2TB drive - now has NO partition, and I get the same error.
>
> I can insert a small 64k flash drive into the same port and run these commands - then fdisk works fine.
>
> Any idea, please, why these external USB hard drives aren't working?
>
> Thx
>
>
>
> _______________________________________________
>
>...