Midnight Blues's advice is absolutely correct, but of course it's getting more difficult to buy 2GB SD/microSD cards now and they seem to cost as much or more than 4GB cards. Although, there's a trick that i found to work on old Garmin devices which could only see FAT16 media cards up to 2GB. Most of them have now had their fw updated so they can read larger FAT32 formatted cards even if they can still only see files up to the FAT16 file size limit of 2Gib minus 1 byte, but some really old Garmins are like these VDO units, still stuck with FAT16.
You may like to try this with your 4GB card: Using [Only registered and activated users can see links. ], create a partition of 2047MiB [thus keeping it under 2GiB] and format that partition to FAT16. It's referred to as simply 'FAT' in Windows properties of course. Although 4GB cards are factory formatted as FAT32 usually, they are really only up to 3.8GiB or so [2GB cards are around 1.84 to 1.86GiB] and even the built-in Windows tool will let you format any 4GB card in FAT but it isn't so easy to create an under 2GiB partition using Windows as it is with RMPrepUSB. There's other 3rd party tools available as well though. If those VDO units are like old Garmins they will simply see the partition as a smaller card. Just follows these settings and leave the rest of the space unallocated:
[Only registered and activated users can see links. ]
As an experiment i created an under 2GiB FAT partition on a 32GB CF card and even that works in an old Garmin StreetPilot 2610, so you can probably use any size card for this.
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