Oh, I see. It seems that this device has a wrecked partitioning schema.
It seems you are using the raw device ("sdb" instead of the first
partition of the device ("sdb1"). However, there also seems to be a
partition table on it:

dmesg:
[  300.939196]  sdb: sdb1
[  300.941070]  sdb: p1 exceeds device capacity
[  300.941469] sd 4:0:0:0: [sdb] Attached SCSI removable disk
[  300.941506] sd 4:0:0:0: Attached scsi generic sg3 type 0
[  301.055047] attempt to access beyond end of device
[  301.055056] sdb: rw=0, want=4294967044, limit=7503872
[  301.055060] Buffer I/O error on device sdb1, logical block 1073741760

kernel:
04:10:27.415 [I] osspec.c:966: hal_util_find_known_parent: 
'/sys/block/sdb/sdb1'->'/sys/block/sdb'
04:10:27.415 [I] blockdev.c:874: block_add: sysfs_path=/sys/block/sdb/sdb1 
dev=/dev/sdb1 is_part=1, parent=0x08100560
04:10:27.415 [I] blockdev.c:1448: Ignoring hotplug event - cannot read 'size'
04:10:27.415 [W] blockdev.c:1481: Not adding device object

Did you ever reformat/repartition this device? Can you please give me
the output of

  sudo fdisk -l /dev/sdb

? Can you mount /dev/sdb1 instead of /dev/sdb?

-- 
Sony Walkman NWZ-A816 not recognized so not mounted.
https://bugs.launchpad.net/bugs/303894
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