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Max Official Capacity: 32GB (Tested up to 32GB (Plug & Play))
Setup / Formatting: FAT32 (32GB cards come pre-formatted in FAT32)
Minimum Speed Class: Class 10
Technical Note: 64GB+ cards ship formatted in exFAT, which Garmin Express and TomTom MyDrive cannot read.
📋 Official Spec / Manual Source: TomTom Official Support — Compatible Memory Cards for Map Updates ↗
Need help formatting or fixing an error? See our guides for Windows 10/11, Mac, Dashcam/Camera Card Error Fix, or Garmin Card Degraded Fix.
Get a 32GB SanDisk Ultra card (Do NOT buy 64GB or larger). TomTom GO Discover / GO Classic / GO Exclusive / GO 520 uses a 32GB microSD / SD Card rated Class 10. Garmin, TomTom, and truck Sat Navs reject 64GB and 128GB cards. A 32GB card works straight out of the packet for map updates with zero setup.
The official maximum supported capacity for TomTom GO Discover / GO Classic / GO Exclusive / GO 520 is 32GB (tested up to 32GB (Plug & Play)). For the best balance of price and reliability, our recommended sweet-spot size is 32GB.
32GB ≈ Holds full UK & All-Europe map updates + speed camera databases with 15GB+ to spare. Choosing 32GB gives plenty of headroom without overpaying.
95% of Sat Nav 'Card Not Recognized' issues happen because someone bought a 64GB+ card. Stick to 32GB! 64GB+ cards ship formatted in exFAT, which Garmin Express and TomTom MyDrive cannot read.
Setup requirement: FAT32 (32GB cards come pre-formatted in FAT32). 32GB cards come factory pre-formatted in FAT32, so you can insert the card straight out of the packet into TomTom GO Discover / GO Classic / GO Exclusive / GO 520 with zero computer formatting needed.
Yes. Unbranded or counterfeit marketplace cards frequently spoof their capacity or fail to sustain Class 10 write speeds, leading to corrupted recordings or 'Card Error' warnings. Stick to genuine, branded cards from a reputable retailer to ensure full manufacturer warranty coverage.
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