I am a new owner of a Tom Tom One, and wanted to know what is the maximum addressable external memory (SD card) on the device. I know that 2G and even 4G cards are out there, but will not work if those memory locations cannot be addressed by the device. I have an advance instruction manual, but this issue was not addressed. This issue came up with my Palm Tungsten E2, and that was settled at 1G max.
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I am assuming that, without being a GEEK, you are sufficiently proficient with a computer. I will describe the procedure with all the necessary details. I use Windows XP and all folders I refer to are in Windows OS hierarchy. I have tried all except starting from the SD card, I happen not to have a 2GB card ready. I suggest you read the whole post, think about its feasability from your point of view, and proceed from there. If you have any misgivings about what I say, DO NOT DO IT. I shall NOT BE HELD RESPONSIBLE FOR ANY DAMAGE TO YOUR GPS.
First of all you should install the HOME application on your computer. Then you connect your GPS to the computer. When it asks you if you want to connect to the computer tap YES, and the HOME application will launch. You may let it perform an update (if any ) of the OS (application that manages the GPS). Do not let it make any update of the OLD map. On each screen you have a CANCEL button.
Use the TomTom Home Application to backup your device. The backup will be stored on your computer, and you will be able to restore it in case of a problems.
Disconnect your GPS and insert the SD Card in slot. Then connect the GPS to the computer and let it communicate with the HOME application. When HOME launches it will show you the internal memory of the GPS and the SD card and you are asked to select from where to run the device. Select the external SD card.
If any thing goes wrong STOP.
In the main window of the HOME application use the right arrow to go to go to Backup and restore icon. Click the icon, HOME will restore the application and the old map, all that is on the internal memory.
If that does not work, I think you should copy the content of the backup folder \My Documents\TomTom\HOME\Backup\GO\Backup01 on the SD card. and try restarting the system from the external card.
What remains to be done is to look for the new map and put at the right place in the HOME folder. Here I will show you the directory hierarchy in WindowsXP On my computer the map is \My Documents\TomTom\HOME\Download\complete\map In this directory there is folder called North_America_2GB. It contains a 1kB activation Zip archive file, a 1.5GB map zip archive, a 6kB table of contents (. toc file) and two image files.
Once the application and the map are on the external SD card you should be able to start the device from the internal memory or the SD card. When you turn it on you will probably see two icons (one of the internal mempory and the other for the SD card) . They will be flashing for a short while. You have to tap the one that you want to start with.
I saved the map on to my computer from the tom tom in Tom Tom Home and installed it on to a new SD card and now it working perfectly. I bought a 2mb SD card for £6.70 put it into a card reader and connected to computer and installed map and it gave me the instructions to put into device (Tom Tom) and switch on to connect then off and back into card reader to finish. Then I disconnected device which is important to do by the way put the new Sd card into Tom Tom and it is workink perfectly. I hope this help others who have problems.
The XLS which is not that much different and supports 4Gb as used in mine which allows me to keep maps of the US,Canada, UK, and the whole of europe on it and swap at will. I bought a cheap generic one. I do kow that those cards that use micro sd can and do have problems so best to avoid the micro type unless your device takes those specifically
more than likely, I just purchased a new tomtom sd card on ebay with all the new maps on it, ver.7 got it for a UK seller no problems, did you back it up on your computer? hopfully you did, then you can just connect it to tomtom home and reinstall it.
I think you will find that the tomtom one 3rd edition is a sealed unit.
No SD slot.
But it does have 1GB of RAM for storage and 32MB RAM for system use.
Pretty much the same internal architecture as an early handheld PC.
All updates are done through USB.
Hope this information is useful.