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  1. #1
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    Default Garmin 12XX drawing problem

    ciao guys,
    need your expert view as I'm facing some issues using my Garmin 1240.
    See the video below as self explainatory:

    I've already tried to:
    1) download a new map
    2) downgrade the firmware
    3) reduce size of the map
    4) defragment the unit (copying everything on my laptop then everything back to the unit)
    5) removed db file in the SQL folder

    Any further hint to remove this annying issue not so evident till 1 month ago? I thought was related to the upgrade of the firmware but also going backwards is not solving this.
    Thanks.

    L

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  3. #2
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    Neil's Avatar
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    Did you hard reset it after update? 'First Aid' for any weird behaviour. [Hold lower RH corner as turn unit on].
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  4. #3
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    Default

    Yes, forgotten to tell this. Hard reset several times :-)

  5. #4
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    The only issue I see is that the map drawing speed is too slow.

    You can try erasing NV ("ergn,41" command in update.txt, read [Only registered and activated users can see links. ]) and formatting the internal flash drive (while making backups, of course. read [Only registered and activated users can see links. ]), and copying back the minimal number of files that are required for the unit firmware to run normally. I guess, the only item you need is the Garmin folder. Everything else should be recreated by the unit firmware.
    Thus you would erase most of the unit "life experience".

    And then you can install the map of interest and see how it behaves.
    If this fixes your issue you can restore the missing files from the backup or by running WebUpdater.

    Also what is the target map? Are you building it on your own? Have you checked if this is the map issue by using other maps?
    Last edited by kunix; 29th May 2013 at 09:22. Reason: corrected typos

  6. #5
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    Default

    These Nuvi's are not famous for Quick Map Redraw the 1300 is also sluggish.
    Some Tips.
    Install only the Map tiles That you need.
    Remove Dem maps from unit and SD Card.
    Remove all unused Maps from Unit and SD Card.
    Remove all JCV files from Nuvi and SD Card.
    As Kunix suggested. Remove Unused files from Nuvi. (Voices Texts etc etc)
    Last edited by dasilvarsa; 29th May 2013 at 10:36.
    The difference between stupidity and genius is that genius has its limits.
    Albert Einstein.

  7. #6
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    Quote Originally Posted by dasilvarsa View Post
    As Kunix suggested. Remove Unused files from Nuvi. (Voices Texts etc etc)
    My suggestion is a little bit more subtle It also takes into account possible filesystem fragmentation I'm not sure defragmenting works as expected on flash media.

  8. #7
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    No, defragmentation can even have a bad effect over a flash memory. Only applicable for a HDD.

    BTW think it is possible a little overclock of the CPU.
    Last edited by ddabcd277; 29th May 2013 at 11:01.

  9. #8
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    I was informed of this opinion a while back by a friend who is a computer tech: "Defragging flash media is at best unnecessary. Flash does not have to 'dart all over' like mechanical drive seek heads do if the info is in non-adjoining clusters. Regardless of where the data is, in a flash drive the seek time is almost instantaneous. In fact, because of the built-in 'wear leveling' of flash drives defragging them can even be counter-productive and life-shortening". Just repeating what he told me in an email.
    'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
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  10. #9
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    Neil, it depends on the technical details. Flash chips can only be read by pages (typical page size is 2048 or 4096 bytes), i.e. if you want to read a byte of some pages you have to wait for the whole page to be transferred. And if the filesystem cluster size is less than the page size, fragmentation could affect the reading performance.

    For example let's imagine that the cluster size is 512 bytes and the page size is 2048 bytes.
    Then the reading speed of an extremely fragmented file (i.e. each cluster of it belongs to a separate page) would be 2048/512=4 times slower than the reading speed of a totally defragmented file.

    The writing speed is even more dependent on the fragmentation, as flash pages have to be erased before being rewritten, and only the whole block (typically a block is 32-128 pages) can be erased. That's why in the worst case we would have to rewrite 128*4096 bytes of flash in order to write 512 bytes. That would be a disaster.

    Maybe this device is so slow because it's writing some file too slowly, who knows?

    So without precise knowledge about the page size of the flash chip and the filesystem used I wouldn't be that sure.
    Last edited by kunix; 29th May 2013 at 11:33.

  11. #10
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    Wow. i actually understood that. [Either i'm becoming more computer literate or you could moonlight as an instructor at the local tech college].
    'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
    Please don't spam. Posts serving no purpose other than to thank or to ask about hidden links are trashed or deleted, it's GPSPower's policy. Please don't spam.
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