The first thing to figure out when buying a microSD card is how much space you need. Modern cards are available from 32GB to 512GB, with a few offering 1TB models. SanDisk's 128GB Extreme card has sequential write speeds up to 90 MB/s, while higher-capacity versions reach up to 130 MB/s.
For most users, a 128GB or 256GB card strikes a balance between price and capacity, with 512GB serving for those requiring more storage. While a 128GB card could cost around $15, a 512GB variant might lie between $40 to $50.
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