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如果有大檔案傳遞或隨身帶著走的需求，你會怎樣處理呢？ 隨身碟、行動硬碟或利用雲端？隨身碟一般容量不大、傳輸速度也不快，行動硬碟空間雖大，但每秒傳輸速度也就百 MB 左右，現在雲端硬碟相當普及且便宜，大檔案傳輸沒問題，但往往受限於網路狀況與速度而需花更多時間等待。
相比之下，對於影像工作者、設計師、遊戲玩家等常有大檔案儲存、攜帶使用需求的人來說，外接式 SSD 絕對是目前最佳解決方案。
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Cruical X8 是記憶體製造商美光旗下品牌 Crucial 的高階可攜帶式 SSD，針對有行動儲存需求用求而推出，主打體積輕巧易攜帶，具備 USB 3.2 Gen2 介面且使用Type-C 連接電腦等裝置，是相當主流的規範。
最高循序讀取速度可達 1050MB/s，可用於 PC、MAC、甚至 PS、XBOX 等家用遊戲機，並提供 1TB、2TB 兩種容量與三年有限保固。
Crucial X8 使用了 64 層堆疊 3D QLC NAND 快閃記憶體，鋁製外殼結構包覆，除了輕量化、保護性更好，還能透過材質將 SSD 元件的熱量往外殼傳遞散熱。
外殼表面在透過黑色噴砂陽極處理，結合外殼兩端的橡膠保護套，可以避免不小心摔落而損壞的風險，根據原廠資料可承受約 2 公尺摔落的力道。當然，還是請使用者要小心，盡量別摔到這美美的 SSD。
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背面標示產品型號與容量，本次測試的是目前最高容量 2TB 版本。
Crucial X8 本體採用 USB-C 介面，配件提供長約 20 公分的 USB 3.2 Gen 2 C to C 傳輸線，以及一個 UCB-C to A 轉接頭，皆可供應 10 Gbps 傳輸頻寬，Type-C 與 Type-A 轉接頭可應付目前主流介面需求，所以基本上只要裝置支援外接行動碟，幾乎就都能使用。
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Crucial X8 本體、USB 3.2 Gen 2 C to C 傳輸線，以及 UCB-C to A 轉接頭。
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從 CrystalDiskInfo 偵測的資訊可見，Crucial X8 外接式 SSD 符合 MVMe 1.3 規範，並以 UASP 協定傳輸，標示容量為 2000GB，實際可用容量 1.81TB。
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CrystalDiskMark 8.0.4 測出每秒 1056.11MB / 1011.88MB 的循序讀寫速度，以及讀取 6.1 萬／寫入 6.6 萬 IOPS 的 4K QD32 隨機讀寫。4K Q32T16 隨機多工讀寫速度為每秒 240.93MB / 270.42MB。
ATTO Disk Benchmark 最大讀寫速率出現在 256KB 以上，讀取速度可達 1006.39MB/s、寫入速度可達 966.9MB/s，在 QD32 測得的 IOPS 數據讀取最高為 39.30K、寫入速率達38.06K。AS SSD 則顯示此 SSD 未採用壓縮寫入。
在 USB 3.2 Gen 2 介面下，無論以 USB Type-C 或透過隨附轉接頭轉接至 USB Type-A，使用兩種介面傳輸效率都相當不錯。
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Crucial X8 當作 Macbook 筆電的外接儲存相當方便。
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拿來作為 PS5 的擴充外接儲存碟，遊戲大作隨身帶著走。
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對於時常處理大量檔案的影像工作者來說，Curcial X8 同時有大容量、高速存取的優勢。
實際使用下來，Crucial X8 傳輸速度可達每秒 1050 MB，對於大檔案儲存相當快速省時，拿來儲存遊戲也可以放好幾十款，無論 PC 或是 MAC 使用者，甚至是搭配家用遊戲主機當外接儲存空間都很稱職。
另外由於 Curcal X8 體積相當輕巧，同時支援 Type-C 與 Type-A 接口，滿足了主流使用需求的期待，並提供多種容量選擇，又有大廠高品質快閃記憶體顆粒的保證，可說是一款全方位的高速外接擴充儲存裝置。
Model：蘇小立
特別感謝：Crucial
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