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  1. #21
    iGO Moderator How to reduce the size of a gmapsupp.img file on a card???
    How to reduce the size of a gmapsupp.img file on a card???
    Boki_Srb's Avatar
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    Jun 2014
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    Two notes:
    - for older devices, reading larger cards is not firmware then hardware problem. The same goes for older standalone (USB) card readers. You have reader and following chip projected to read exact type of cards. No firmware helps there.
    In fact not size of was problem card then type. Older cards don't have class. There were also 4GB SD and CF cards (I even saw 8GB SD industrial), but in that time they were extremely rare and expensive. Especially those declared for high speed (4GB SD 150x were fastest then and damn high price, I bought 2GB).
    - It's good to have a quality card. But the fact that you use Class 10 is absolutely unnecessary. Your device (or any other navi) can not use its speed, nor the amount of data it reads from them requires such a flow. The fact is that quality cards class 2 meet the requirements of such devices.
    Free explanation: High Class cards (speed) are today needed mostly for digital cameras, when card have to record several MegaBytes large pic in only 1/10 of a second. Clear? And of course, you need even faster to transfer all of the recording to your PC

    P.S. Capacity of chips on cards and other flash based memory is whole 2/4 or more GB (Giga Bytes). BUT. But addressing, file system of the chip itself and spare blocks take away the useful space and for the user stays less....
    There is even a worse situation with modern hard drives (and some other devices - who said Mobile Phones ) where even firmware is located in memory chip(s).
    Last edited by Boki_Srb; 25th September 2017 at 10:36 PM.
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  3. #22
    Important User How to reduce the size of a gmapsupp.img file on a card???
    How to reduce the size of a gmapsupp.img file on a card???How to reduce the size of a gmapsupp.img file on a card???How to reduce the size of a gmapsupp.img file on a card???How to reduce the size of a gmapsupp.img file on a card???
    osiris4isis's Avatar
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    Apr 2012
    Darkside of the Moon
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    Quote Originally Posted by jinxxxxxx View Post
    When you find that you can't load all of the USA from the 2018.20 mapset I ques you will just have to use 2 2gb CF cards.

    In reality it doesn't matter how much data a card can hold if it can't hold all the data you need it to hold it is of little use. And I do know what I'm talking about.
    Please stop posting nonsense. USA map 2018.20 is less than 2GiB. Even if you find ANY map that's more than the memory card you're using, you can still reduced it via MapSource.

    Quote Originally Posted by jinxxxxxx View Post
    Now I only use Sandisk Class 10 for my maps if you guy are dumb enough to trust unbranded memory that says a lot about you.
    Nobody said to "trust unbranded memory." As a matter of fact, we posted it to persuade/warn users not to trust it and more importantly, WHY not to trust it.

    It's clear to me from your many replies that YOU have no clue what you are talking about. Let the posts be self evidence of who knows what.
    Last edited by osiris4isis; 25th September 2017 at 10:38 PM.
    Do not PM me with questions. That's what a forum is for.

  4. #23
    Pro-Member Butters's Avatar
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    Jul 2017
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    Well, to be precise the Lower 49 USA 2018.20 supplied as a compiled img file by Garmin via GarminExpress is 2,053,636,096 bytes or 1.91259765625 GiB (BINARY gibibytes) so won't fit quite on my Sandisk (so-called 2GB) cards which have barely more than 1.90 GiB of available space and definitely won't fit on any '2GB' microSD/SD which never seem to have more than 1.87 GiB available.

    GMapTool info:
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    2 GB CF empty The CF card isn't short by much though.

    However the Lower 48 USA without any Caribbean Islands or Hawaii is able to fit on my '2GB' cards, which have usable space of 2,047,541,248 bytes, just a tad over 1.90GiB, with 5.06MiB to spare because the bare 48 states img is indeed well under 2GiB. Here's the proof:

    MI USA Lower48

    Unfortunately going from past experience with others who are unable or unwilling to get their heads around this stuff, I doubt our East Coast gentleman will acknowledge his misconceptions despite the clear evidence offered. It all comes back to confusion/conflation of decimal and binary forms of 'gigabyte' and an unwillingness by ppl to do the maths. He's hardly the first and won't be the last.


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