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Roamio 4Tb Drive Development Thread

Discussion in 'TiVo Upgrade Center' started by eboydog, Apr 25, 2014.

  1. jmbach

    jmbach der Neuerer

    Jan 1, 2009
    Not sure the the mod is important in your edits, but did you make the change in the Apple Disk module to handle images larger than 0xEFFFFFFF?
  2. telemark

    telemark New Member

    Nov 12, 2013
    I added a different version of the patch to my repository now and tested.
    mfslayout does work with a 4TB image.
  3. telemark

    telemark New Member

    Nov 12, 2013
    Attached is 3 different partition maps using the same offsets.

    The all 32bit one is the same as the original used in imaging.
    Then there's an all 64bit one.
    And an all 64bit, except one.

    The results I got on a Base Roamio, running 20.3.8:
    All 32bit works
    All 64bit, the roamio triggers a reformat.
    All but first one, works again.

    If someone wants to try this at home, I used the command:
    dd if=4TBr1-64.map of=/dev/sdX count=14 seek=1
    to install them.

    Attached Files:

  4. jmbach

    jmbach der Neuerer

    Jan 1, 2009
    Similar results Roamio Plus with 20.4.1

    All 32bit - works
    All 64bit - reformat loop
    Mixed with Partition 1 32bit and the rest 64bit - works

    Now what would happen if we had an image that:
    a) had at least one partition start beyond 2.2TB
    b) a partition larger than 2.2TB
    c) a combination of the above.
  5. ggieseke

    ggieseke Well-Known Member

    May 30, 2008
    In my experience, 64-bit partition table entries trigger a reformat and boot loop if any of the entries go beyond a 32-bit value (0xFFFFFFFF) for the start or size fields. The partition tables we're talking about here don't need to be 64-bit, so as long ast the first Apple_partition_map entry is 32-bit it seems to work.

    I haven't specifically tested a Roamio running 20.4.1, but 20.3.8 still had those limitations and I don't think anything fundamental has changed since then. For now I think 5 & 6 TB drives are still out of the question. A properly prepared 4TB drive with the MFS headers and zone maps already in place seems to work, as telemark's work has shown.

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