Oops.. my bad...
It seems like wireshark misses some data while capturing on usbmon
device. According to LBA addresses in subsequent SCSI commands it looks
like on a request of 240 sectors host really gets from device 240
sectors. On the other hand for each such request in the capture exists
only one URB_BULK packet with data and the size of this data covers only
120 sectors (61440 bytes). As a consequence size of capture file is
about twice less than size of files transferred to create this capture.
In my previous examinations I've took into account only size of URB_BULK
packets and missed out the difference between subsequent LBA addresses.
For such URB_BULK packets wireshark states "URB length: 122880", "Data
length: 61440". Reading of Documentation/usb/usbmon.txt didn't clarified
for me what does this mean. Whether this is limitation of usbmon or a
feature of wireshark.
Sorry for that inconvenience.
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