{"id":4069,"date":"2023-03-07T06:48:28","date_gmt":"2023-03-07T06:48:28","guid":{"rendered":"https:\/\/yousanusb.com\/?p=4069"},"modified":"2025-10-23T14:16:50","modified_gmt":"2025-10-23T14:16:50","slug":"how-fast-is-the-data-transfer-speed-of-the-usb-flash-drive","status":"publish","type":"post","link":"https:\/\/www.yousanusb.com\/fr\/how-fast-is-the-data-transfer-speed-of-the-usb-flash-drive\/","title":{"rendered":"Quelle est la vitesse de transfert des donn\u00e9es de la cl\u00e9 USB ?"},"content":{"rendered":"

The commonly mentioned transfer speed of a USB flash drive refers to its read and write speeds, which are not fixed values. These speeds are primarily influenced by four key factors: interface type, storage protocol, flash memory chips, and controller chips. Additionally, there exists a difference between \u201cread speed\u201d and \u201cwrite speed,\u201d with read speeds typically being significantly faster than write speeds.<\/p>\n\n\n\n

1.Interface Type + Storage Protocol (Key Factors)<\/h2>\n\n\n\n

USB ports are categorized into USB-A (traditional interface) and USB-C (Type-C, referring only to the physical connector shape; compatibility depends on the protocol). The core protocol determines the maximum speed limit. Common types and parameters are as follows:<\/p>\n\n\n\n

Interface \/ Protocol<\/th>Theoretical Transfer Rate<\/th>Actual Read Speed<\/th>Actual Write Speed<\/th><\/tr><\/thead>
USB 2.0 (Hi-Speed)<\/td>480 Mbps (\u2248 60 MB\/s)<\/td>10\u201330 MB\/s<\/td>2\u201310 MB\/s<\/td><\/tr>
USB 3.0 (3.1 Gen 1)<\/td>5 Gbps (\u2248 625 MB\/s)<\/td>80\u2013200 MB\/s<\/td>30\u2013100 MB\/s<\/td><\/tr>
USB 3.1 Gen 2 (10Gbps)<\/td>10 Gbps (\u2248 1250 MB\/s)<\/td>150\u2013400 MB\/s<\/td>80\u2013200 MB\/s<\/td><\/tr>
USB 3.2 Gen 2×2<\/td>20 Gbps (\u2248 2500 MB\/s)<\/td>300\u2013800 MB\/s<\/td>200\u2013500 MB\/s<\/td><\/tr>
USB4 (compatible with Thunderbolt 3\/4)<\/td>40 Gbps (\u2248 5000 MB\/s)<\/td>500\u20132000 MB\/s<\/td>300\u20131500 MB\/s<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Common Misconception: Type-C Port \u2260 High Speed! Many inexpensive Type-C flash drives actually use the USB 2.0 protocol, resulting in slow speeds. Always check the \u201cprotocol specification\u201d on the packaging (e.g., USB 3.2 Gen 2).<\/p>\n\n\n\n

2.Flash memory chips (affecting speed and stability)<\/h2>\n\n\n\n
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Flash memory is the \u201cstorage core\u201d of USB drives, and its type determines write stability (especially during large file transfers):<\/p>\n\n\n\n