A colleague brought over a DVD which a friend of his created as a backup from his computer, due to malware or whatever on his computer.
This is basically the ultimate fuzzy question, but here's what I know.
He used a backup program he found on his HP laptop. Since he was an idiot (I can only assume he was), he didn't write down the name of said program, nor did he check the contents of the DVD after making his backup. The laptop was then returned to the outlet for a full restore.
The DVD is a DVD+R Philips DVD. The DVD, when popped into my DVD drive, claims that there is 265 MB free out of 4.37 GB. The contents, when opened, is empty, no files (I've looked for hidden and system files as well.)
My initial hypothesis is that he's managed to write a second session with an empty TOC onto the drive, thus hiding the contents. Is this possible?
Or, he managed to not close the session. Is this possible? How would I know?
I'm basically looking for hints as to what I should look for on this DVD to see if there is any content on it at all.
Is there some software program I can use that would look at the contents in a more detailed manner? I tried downloading a program called "CD & DVD Analyzer", but it apparently won't even start the installer, so that didn't help.
I opened up ImgBurn, selected the Verify mode, and let it run a few seconds, and the info-pane contains the following, I'm afraid it doesn't tell me anything because I don't know how to interpret that information:
HL-DT-ST DVDRAM GT20L DC03 (ATAPI) Current Profile: DVD+R Disc Information: Status: Incomplete State of Last Session: Empty Erasable: No Sessions: 4 Sectors: 2 157 040 Size: 4 417 617 920 bytes Time: 479:22:40 (MM:SS:FF) Free Sectors: 136 016 Free Space: 278 560 768 bytes Free Time: 30:15:41 (MM:SS:FF) Next Writable Address: 2159088 TOC Information: Session 1... (LBA: 0) -> Track 01 (Mode 1, LBA: 0 - 1103583) Session 2... (LBA: 1103584) -> Track 02 (Mode 1, LBA: 1103584 - 2156639) Session 3... (LBA: 2156640) -> Track 03 (Mode 1, LBA: 2156640 - 2157039) -> LeadOut (LBA: 2157040) Track Information: Session 1... -> Track 01 (LTSA: 0, LTS: 1101536, LRA: 0) Session 2... -> Track 02 (LTSA: 1103584, LTS: 1051008, LRA: 0) Session 3... -> Track 03 (LTSA: 2156640, LTS: 400, LRA: 0) Disc Control Blocks Information: TSSTcorp TS-L632N Physical Format Information (ADIP): Disc ID: MBIPG101-R05-01 Book Type: DVD-ROM Part Version: 1 Disc Size: 120mm Maximum Read Rate: Not Specified Number of Layers: 1 Track Path: Parallel Track Path (PTP) Linear Density: 0.267 um/bit Track Density: 0.74 um/track First Physical Sector of Data Area: 196 608 Last Physical Sector of Data Area: 2 491 711 Last Physical Sector in Layer 0: 0 Physical Format Information (Last Recorded): Disc ID: MBIPG101-R05-01 Book Type: DVD-ROM Part Version: 1 Disc Size: 120mm Maximum Read Rate: Not Specified Number of Layers: 1 Track Path: Parallel Track Path (PTP) Linear Density: 0.267 um/bit Track Density: 0.74 um/track First Physical Sector of Data Area: 196 608 Last Physical Sector of Data Area: 2 491 711 Last Physical Sector in Layer 0: 0
Ok, this looks promising. I installed IsoBuster, though in free version for now, and it shows me the contents, though it won't extract any of the files without a license, so it looks like this might work as soon as I get the guy to pay for the license.