SAGEM DTR67250

How to use TestDisk to recover lost partition
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daystrom
Posts: 19
Joined: 17 Apr 2012, 02:58

Re: SAGEM DTR67250

#11 Post by daystrom » 18 Apr 2012, 10:50

Do you have a link to the documentation on how to do a dump?
I'm not sure how its done. Thanks

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daystrom
Posts: 19
Joined: 17 Apr 2012, 02:58

Re: SAGEM DTR67250

#12 Post by daystrom » 18 Apr 2012, 13:23

sagem-sector-0.jpg
Hex Dump of SAGEM sector 0
sagem-sector-0.jpg (85.61 KiB) Viewed 2381 times
Hope this helps.

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remy
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Re: SAGEM DTR67250

#13 Post by remy » 18 Apr 2012, 15:27

It's very curious. Your first sector does have a signature, but it's 0xAA55 instead of 0x55AA.

It may be because your enclosure use inversion in byte order.

At 0x1Bh, there's a partition begin :
80 (bootable)
0EFFFF : begin of partition (old MBR before 32GB limit)
0B : FAT32
0EFFFF : end (like above)
E0A3261B : number of sector before partition (usaly read last-to-first : 0x1B26A3E0) but that make no sense there
8675D101 : size of the partition (usaly read last-to-first : 0x01D17586) but... no sense too.

It looks like your MBR was written with ytorder inversion (big-endian) instead of the way it should be (little-endian).

How to deal with that ? I don't know... Please provide the same hexadecimal dump inside the enclosure, to see if there's a difference...

I'll ask Christophe if he has an idea how to solve this.

daystrom
Posts: 19
Joined: 17 Apr 2012, 02:58

Re: SAGEM DTR67250

#14 Post by daystrom » 18 Apr 2012, 16:02

not sure what is meant by "inside the enclosure", so I'll give you sectors 1 to 256
sagem-sector-1.jpg
SAGEM sector 1
sagem-sector-1.jpg (90.38 KiB) Viewed 2377 times
sagem-sector-2.jpg
SAGEM sector 2
sagem-sector-2.jpg (89.75 KiB) Viewed 2377 times
Sector 3 is filled with 0x01
So has sector 4, all the way to sector 255. Sector 256 has data.
sagem-sector-256.jpg
SAGEM sector 256
sagem-sector-256.jpg (86.12 KiB) Viewed 2377 times

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remy
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Re: SAGEM DTR67250

#15 Post by remy » 18 Apr 2012, 17:05

sector 256 also has a signature AA55 instead of 55AA.

I've asked to Christophe, who told me that you'll have to duplicate your disk with dd tool (under gnu/linux) using option conv=swab.

Do you have a linux working and/or some knowledge about it ? If you try alone, be really carrefull with dd to copy source on destination, and not destination over the source... :cry:

I'll help you, but that's just to know what kind of help you'll need.

daystrom
Posts: 19
Joined: 17 Apr 2012, 02:58

Re: SAGEM DTR67250

#16 Post by daystrom » 18 Apr 2012, 17:41

I dont have linux. I did make an image of the HD -- not too confident about the software, though, because half way through the copy, drive 0 disappeared from the list of HDs. But the operation did complete, and I've used the software before on other drives successfully.

I did a search for HDD1_AV1 and found a few links, notably
http://www.generationcable.net/gcmag_faq_tv.php, and http://wiki.lagamel.fr/doku.php?id=sage ... :disquedur

Phil78 on http://www.tvnt.net/forum/sagem-pvr-624 ... 3-135.html, suggests that sagem is using an Amiga file system.

I used iRecover, and although it found no files it did show that it had a 15Gb partition. Which seems to tally with what they say.

I've been assured that http://www.ezvan.fr/public/logiciels/papa/DVBT2MPG.ZIP will read sagem drives, but with my drive a message pops up stating that it cant find the DVBT stream on any devices.
I considered emailing him but his website is in French, I noticed, Remy, that your signature is in French. So, perhaps if you were to email him this may yield quick results.

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remy
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Re: SAGEM DTR67250

#17 Post by remy » 20 Apr 2012, 13:33

I can try to contact him, but that won't be easy to explain a problem without having the disk and made a diagnose of it by myself. And the post you linked is 5 years old :/

In my opinion it may be esaier to drive you with some basic linux commands, so that you will be able to duplicate you disk using conversion to put bytes in a readable order and recover your data then with testdisk.

daystrom
Posts: 19
Joined: 17 Apr 2012, 02:58

Re: SAGEM DTR67250

#18 Post by daystrom » 21 Apr 2012, 12:18

is ubuntu ok, or does it have red hat?
I have a spare HD I can install the OS on.
Is there any other software I'll need to install?

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remy
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Re: SAGEM DTR67250

#19 Post by remy » 21 Apr 2012, 14:34

Ubuntu, perfect.
Installation on spare HD : perfect (you'll have persistance of data, and will work quicker than a liveCD)
Other tools to install :
download testdisk 6.14 for linux after install, uncompress, and copy testdisk_static in your personal folder.
Then, connect your sagem, your disk for duplication, and give feedback for :

Code: Select all

sudo sfdisk -luS

daystrom
Posts: 19
Joined: 17 Apr 2012, 02:58

Re: SAGEM DTR67250

#20 Post by daystrom » 22 Apr 2012, 15:02

The sfdisk shows
Disk /dev/sda: 30401 cylinders, 255 heads, 63 sectors/track

sfdisk: ERROR: sector 0 does not have an MSDOS signature
/dev/sda: unrecognised partition table type
No partitions found

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