Hi,
  I've experienced the same problems with my brand new ;) Entryx MP4-Player. 
It didn't work as it should. Data was not written...

So I googled around and I've found some information about firmware upgrade in 
german:
   http://www.discountfan.de/forumneu/read.php?8,161599,162341

BUT: I've not tried it yet.

Instead here is my solution based on the information I've got here:

[EMAIL PROTECTED]:/etc/udev/rules.d# cat 50-entryx.rules 
SUBSYSTEMS=="scsi", ATTRS{vendor}=="entryx", RUN+="/bin/sh -c '/bin/echo 128 > 
/sys/block/%k/device/max_sectors'" 

It took me quite some time to figure this out....
My questions have been: 
Where and with what name should I write the rule...?
What vendor id, number shall I use...?

But finally with the help of the posting from  Daniel Holbert (many
thanks to you!) I've found the correct information:

[EMAIL PROTECTED]:/# udevinfo -q all -n /dev/sdc
P: /block/sdc
N: sdc
S: disk/by-id/usb-entryx_MP4_Player
S: disk/by-path/pci-0000:00:1d.7-usb-0:2:1.0-scsi-0:0:0:0
E: ID_VENDOR=entryx
E: ID_MODEL=MP4_Player
E: ID_REVISION=1.00
E: ID_SERIAL=entryx_MP4_Player
E: ID_TYPE=disk
E: ID_BUS=usb
E: ID_PATH=pci-0000:00:1d.7-usb-0:2:1.0-scsi-0:0:0:0

I tried to match with the id number and the info from command lsusb (which 
yields "Domain Technologies, Inc." as vendor) and also tried to set the 
ATTR{max_sector}=128 which was just ignored...(I controlled it with:
[EMAIL PROTECTED]:/# cat /sys/block/sdc/device/max_sectors
240
...was always the result...so i used the "echo 128..." variant which works 
fine!)

So I hope, that I could help somebody as you guys helped me! Thanx a
lot!

with best regards
stefan

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USB mass storage stops working after a while
https://bugs.launchpad.net/bugs/61235
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