You need the adapter for the mini/micro SD Cards.
Micro SD cards are smaller in size and have a maximum storage capacity of 2GB. SDXC cards are larger and can store up to 2TB of data. Micro SD cards are compatible with devices that have a micro SD card slot, while SDXC cards are compatible with devices that support the SDXC format.
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Most cameras use SD or Compact Flash memory. Mini SD cards are rarely used, and have been almost entirely replaced by micro SD. You can buy an adapter for a micro SD card and most micro SD cards actually come with an adapter to fit in an SD card reader slot.
only micro sd cards
Micro SD cards and microSDXC cards differ in terms of storage capacity and compatibility. Micro SD cards typically have a maximum capacity of 2GB, while microSDXC cards can store up to 2TB of data. Additionally, microSDXC cards are designed to work with devices that support the exFAT file system, allowing for larger file sizes and faster data transfer speeds compared to micro SD cards.
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Sandisk is one of the largest producers of all forms of flash-memory based storage cards, including micro SD type. Kingston, ADATA, and Patriot are some other manufacturers of cheap micro SD cards.
Micro SDXC cards have a higher storage capacity than regular micro SD cards, typically ranging from 64GB to 2TB. Micro SD cards, on the other hand, have a maximum capacity of 2GB. If your device requires more storage space, a micro SDXC card would be more suitable.
There isn't a certain sd card for it. The sd card is called a micro sd card. These are usually found at stores that sell phones because phones ONLY take micro sd cards. if you want a regular sd card and You have a micro sd card, there is a thing called a micro sd card adapter that you can slide in your dsi and insert the micro.
Micro SD cards.
Only micro SD cards work with R4i.