On Thu, 31 May 2012, Jens Schweikhardt wrote:

so I decided to try two HW technology advancements in one go.
I have a brand new shiny 1TB USB3.0 external disk, that when plugged
to an USB2(two!) reports

   da5 at umass-sim2 bus 2 scbus6 target 0 lun 0
   da5: <ST1000LM 024 HN-M101MBB 0000> Fixed Direct Access SCSI-2 device
   da5: 40.000MB/s transfers
   da5: 953869MB (244190646 4096 byte sectors: 255H 63S/T 15200C)

(The vendor, Jmicron, has put an NTFS on it, with a disk manual as a pdf file.
Strangely, I cannot mount it with
# ll /dev/da5*
crw-r-----  1 root  operator    0, 236 May 31 15:05 /dev/da5
crw-r-----  1 root  operator    0, 237 May 31 15:05 /dev/da5s1
# mount -t ntfs -o ro /dev/da5s1  /mnt
mount_ntfs: /dev/da5s1: Invalid argument
)

It may not actually be an NTFS filesystem.  Try
# file -s /dev/da5s1

Much more likely to be a USB problem than something to do with block size.
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