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TiVo Volume Header Format

Discussion in 'TiVo Underground' started by Marconi, Jan 3, 2011.

  1. jmbach

    jmbach der Neuerer

    Jan 1, 2009
    I had an OLED S3 that it happened to after a power blip. (Also had bad capacitors in the power supply). Fix was similar to squints. Also replaced the caps and place it on a APC power backup. Have not had an issue since. BTW the magic number is 0xABBAFEED in 32 bit MFS header in the OLED S3 (and I think earlier models as well). In the TiVo HD and later have a 64 bit MFS and magic number 0xEBBAFEED
  2. ggieseke

    ggieseke Well-Known Member

    May 30, 2008
    In MFSLive, WinMFS or DvrBARS lingo the volume header is the MFS volume header, not the drive header. Many people call it the MFS superheader.

    It's the first sector of the first MFS application partition (usually partition 10). There is also a backup copy in the last sector of that partition.

    Fixing it should be fairly easy if you provide the hex dump that telemark requested. Dumping the first 17 sectors on the drive so we can look at Block0 and the APM would also help.
  3. Marconi

    Marconi TiVo Junkie

    Sep 8, 2001
    Page, AZ USA
    Where are these logs? Path?
    I would never do that. The backup image is current, version-wise with the installed version. The original drive, however, has not been back in the THD since I first removed it. Should I ever have to resort to using it, s/w updates will almost certainly be required. I think I may install that drive and update its s/w version just to have it current. Still, I would never copy parts from it since it's a 160 GB drive. The original drive was used only to create a backup image, expanded, and then put on the shelf.

    All backups since then have been to an identical drive to the one in service. All partition sizes match.

    They are where?
    Probably a good idea for the next time this happens.
    No mods beyond the larger drive. The only unusual history is that these "volume header corrupt" incidents seem to be more frequent now.
  4. Marconi

    Marconi TiVo Junkie

    Sep 8, 2001
    Page, AZ USA
    My generic PC hardware is down for repair just now. (The hinge of the hot swap drive bay broke.) Is it safe to put a TiVo drive in a Mac? I'm always afraid OS X will start adding all the files a Mac uses, or start indexing, or "repair" the modified APM that TiVo uses.

    Do I dare put a TiVo drive into a hot swap drive bay connected to my Mac?
  5. telemark

    telemark New Member

    Nov 12, 2013
    Tivo logs are like a linux box:

    /var should be sda9 (hda9) for a Tivo drive... ext2, I think.

    I made a guide once, but if you use a Tivo Boot CD most of it can be skipped.

    I'm not sure what kind of drive bay you can connect to Mac, but I've connected S4 and Roamio drives to OS X many times without issue via USB (to SATA).

    The S4 (should be similar to S3) drive's Partition Map gets recognized, but nothing beyond that...unless you have a ext2 Mac somehow (FUSE). That may be the bigger point, once connected to a Mac, the number of actions that can be taken from there is slightly more limited.

    pdisk, dd, and hexdump should work on OS X. The devices names would change to be /dev/diskX and /dev/diskXs10

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