Thread: testdisk + USB partitions lost

hi all,

need recovering data on usb stick.
have tried multiple times on own testdisk - no success.

device + history:
kingston dt r500 usb (16gb usb-2)
when saving file few days ago, decided hang , nothing, disappeared.
far have done nothing further corrupt.

suspect need define/size partitions it.

current status:
usb doesnt come on machine (running ubuntu 12.04).
dmesg shows following (and partition table kaput)

--
[58813.840044] usb 1-3: new high-speed usb device number 5 using ehci_hcd
[58813.975802] scsi10 : usb-storage 1-3:1.0
[58815.015144] scsi 10:0:0:0: direct-access kingston dt r500 pmap pq: 0 ansi: 0 ccs
[58815.015771] sd 10:0:0:0: attached scsi generic sg6 type 0
[58815.886886] sd 10:0:0:0: [sdf] 16384 512-byte logical blocks: (8.38 mb/8.00 mib)
[58815.887504] sd 10:0:0:0: [sdf] write protect on
[58815.887509] sd 10:0:0:0: [sdf] mode sense: 23 00 80 00
[58815.888131] sd 10:0:0:0: [sdf] no caching mode page present
[58815.888136] sd 10:0:0:0: [sdf] assuming drive cache: write through
[58815.891126] sd 10:0:0:0: [sdf] no caching mode page present
[58815.891130] sd 10:0:0:0: [sdf] assuming drive cache: write through
[58815.894881] sdf: unknown partition table
--

tried on windows machine - usb appears on there.
used testdisk 6.14 + 6.13, want machine go online - machine cannot.

used testdisk 6.10 (log file attached)

first attempts search did nothing.
refined geometry have 1 head 1 sector - did search, deeper search.
nothing.

paste relevant portion of .log file below
(tried attaching log file, wont allow)

please advise next.

thanks,

g.

--
search_part()
disk /dev/sdb - 8388 kb / 8192 kib - chs 16384 1 1
file_read(5,16,buffer,3(3/0/1)) read err: invalid argument
file_read(5,1,buffer,3(3/0/1)) read err: invalid argument
file_read(5,1,buffer,4(4/0/1)) read err: invalid argument
...
[truncated section]
...
file_read(5,1,buffer,16402(16402/0/1)) lseek err invalid argument
file_read(5,1,buffer,16520(16520/0/1)) lseek err invalid argument

results

interface_write()

no partition found or selected recovery
simulate write!

write_mbr_i386: starting...
file_read(5,16,buffer,0(0/0/1)) read err: invalid argument

partition: read error
store new mbr code
write_all_log_i386: starting...
no extended partition

testdisk exited normally.
--

did try photorec in full disk scan mode?

since looks headers , doesn't care partition table, may have more chance of recovery.
alternatively, may try trial version of commercial software - data (my previous favourite, after trying bunch of top rated apps), although have had more luck testdisk/photorec.

trial version of commercial software scan , give list of files can recover. can let save files upto specific size. if haven't tried photorec yet, give go first. it's super fast , has been promising in personal experience.

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