Jason Johnston reported these problems with his external USB hard drive:
http://bugs.gentoo.org/show_bug.cgi?id=250789

The number of reported sectors is off-by-one.

/proc/bus/usb/devices:
T:  Bus=01 Lev=02 Prnt=08 Port=00 Cnt=01 Dev#=  9 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=0dc4 ProdID=0073 Rev= 0.00
S:  Manufacturer=Macpower Technology Co.LTD.
S:  Product=USB 2.0 3.5" DEVICE
S:  SerialNumber=03006C
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
Signed-off-by: Sergey Ovcharenko <velegrin@mail.mipt.ru>
Signed-off-by: Phil Dibowitz <phil@ipom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>