Nintendo Switch 2 指定用的 microSD Express 記憶卡是什麼？快多少？貴多少？
microSD Express 其實是由 SD 協會 (SD Association) 早在 2019 年推出的規格，基於 SD 7.1 規範，將本來用於 SSD 的 PCIe 和 NVMe 技術整合到 microSD 記憶卡中，大幅提升了數據傳輸速度和性能，達致小小的記憶卡也能有飛快的傳輸速度。第一代 microSD Express 為 SD 7.1 規範，是基於 PCIe 3.1 和 NVMe 1.3 技術，理論上最大傳輸速度可達 985 MB/s，更適合需要高速存儲的應用場景，例如 4K/8K 錄影、虛擬現實 (VR)、擴增實境 (AR) 和高性能移動應用。
未來的 SD 8.0、SD 9.1 版本更會有 PCIe Gen4 x1、PCIe G3 x2 和 PCIe Gen4 x2 等介面，理論上能提供接近 2GB/s 傳輸速度，已是微型 SSD 的等級。
傳統 microSD 卡是使用 UHS-I 或 UHS-II/UHS-III 技術：UHS-I 最大理論速度為 104 MB/s；UHS-II 最大理論速度為 312 MB/s；UHS-III 可達 624 MB/s，但仍不及 microSD Express。
一般來說，microSD Express 卡和讀卡器是完全向下相容於現有的 microSD 設備，只是性能會受到限制。然而任天堂這次決定在 Switch 2 主機裡只支援 microSD Express 卡，相信是為了確保遊戲傳輸表現，這與 PlayStation 指明 PS5 SSD 規格、Xbox 有專屬 Expansion Card 的做法相似。
因為 microSD Express 記憶卡在外觀上與傳統 microSD 卡幾乎相同，所以使用者只能透過印在表面上的 EX 標記來區分；傳統 microSD 卡則會標記依據其速度等級（例如 UHS-I、UHS-II）。
目前消費級市場上使用 microSD Express 記憶卡的電子產品並不多，大家甚至可能是因為 Nintendo Switch 2 才會首次接觸。不過記憶體品牌其實已經早有相關產品，Samsung 於去年就宣佈測試首張 256GB microSD Express 記憶卡，連續讀取速度高達800 MB/s；SanDisk 更在今年年初確實開賣了讀取速度高達 880MB/s 的 SanDisk microSD Express。
售價方面，SanDisk microSD Express 256GB 定價 65 美元；128GB 定價 50 美元。如果以同廠的高階系列 SanDisk Extreme microSDXC UHS-I 來比較，256GB 原價僅 28 美元，128GB 更只要 21 美元，雖然售價貴一倍有多，但讀取速度就是 880MB/s 和 190MB/s 的 4 倍差異了。
不意外地，任天堂已經與 Samsung 和 SanDisk 合作各推出一款授權的 Switch 2 專用 microSD Express 記憶卡 256GB，目前價格未明，但相信只會比普通版本相近甚至更貴了。
SanDisk microSD Express 256GB
Amazon 特價 60 美元（需要代運）｜原價 65 美元
立即購買
SanDisk Extreme microSDXC UHS-I 256GB
Amazon 特價 24 美元｜原價 28 美元
立即購買
更多內容：
microSD Express 為行動裝置帶來超高速的資料傳輸
Samsung 新出的 microSD 卡速度已經比一些 SSD 還要快了
microSD EXPRESS 速度翻倍，並引入新的 SD EXPRESS 速度等級
Nintendo Switch 2 分日版、國際版防水貨？日本專用版平足 20,000 日元！
Nintendo Switch 2 正式發表，所有的首發遊戲都在這裡！
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