From the Nintendo support website:
"Compatible SD Card types
The Nintendo DSi is compatible with most SD Cards with the following specifications:
Memory Capacity: Up to 32 GB (Gigabytes)
Type: The Nintendo DSi supports standard SD cards as well as high-capacity SD cards (SDHC) up to 32 GB in size. This includes miniSD and microSD when used with their respective adapters
Speed: SD Cards with a slow speed may experience slow transfer time when loading files, or may not work at all. Slow transfer times can also occur with SD Cards that have a great number of files on them."
"How many blocks are there on an SD Card?
Each save block on the Nintendo DSi takes up 128KB of data. The amount of space available on the a card will vary depending on the size and on files already stored on the card. For example, a 1GB card should have a little over 8,000 blocks available, but there may already be some files stored on the card."
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