{"id":"external-drives.does-the-cable-matter-for-an-external-ssd","url":"/faq/external-drives/does-the-cable-matter-for-an-external-ssd","category":{"id":"external-drives","title":"External drives"},"subcategory":{"id":"speed-and-hardware","title":"Speed, cables and hardware"},"question":"Does the cable matter for my external SSD's speed?","alt_questions":["Why is my USB-C SSD slow with this cable?","Charging cable for external drive","Best cable for external SSD Mac","usb-c cable speed external drive","Speed test low but drive is fast","Thunderbolt cable vs USB-C cable"],"short_answer":"Yes. Many USB-C charging cables carry only slow data, so a fast SSD tests slow on them. Use the drive's own cable or a proper Thunderbolt/USB4/high-speed USB-C data cable, then re-run the benchmark.","answer_markdown":"Yes, a lot. Many USB-C cables — especially ones that came with phones or chargers — only carry slow data speeds, so a fast SSD on such a cable tests slow. Use the cable that came with the drive, or a cable made for the drive's connection (Thunderbolt, USB4 or a 10 Gbps-or-faster USB-C data cable).\n\nAfter changing the cable, open Choose Drive (or Transfer Drive) and click **Run benchmark** to see the difference.","answer_html":"

Yes, a lot. Many USB-C cables — especially ones that came with phones or chargers — only carry slow data speeds, so a fast SSD on such a cable tests slow. Use the cable that came with the drive, or a cable made for the drive's connection (Thunderbolt, USB4 or a 10 Gbps-or-faster USB-C data cable).

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After changing the cable, open Choose Drive (or Transfer Drive) and click Run benchmark to see the difference.

","answer_text":"Yes, a lot. Many USB-C cables — especially ones that came with phones or chargers — only carry slow data speeds, so a fast SSD on such a cable tests slow. Use the cable that came with the drive, or a cable made for the drive's connection (Thunderbolt, USB4 or a 10 Gbps-or-faster USB-C data cable).\n\nAfter changing the cable, open Choose Drive (or Transfer Drive) and click Run benchmark to see the difference.","tags":["cable","speed","usb-c"],"related":[{"id":"external-drives.my-external-drive-keeps-disconnecting","question":"Why does my external drive keep disconnecting from my Mac?","url":"/faq/external-drives/my-external-drive-keeps-disconnecting"},{"id":"external-drives.does-it-matter-which-port-i-use","question":"Does it matter which port I plug the fast drive into?","url":"/faq/external-drives/does-it-matter-which-port-i-use"},{"id":"external-drives.can-i-use-an-adapter-with-my-external-drive","question":"Can I use a USB-A drive with an adapter on my Mac?","url":"/faq/external-drives/can-i-use-an-adapter-with-my-external-drive"}],"applies_to":"all","last_reviewed":"2026-10-01","title":"Does the cable matter for my external SSD's speed? — Storage Studio FAQ","description":"Yes. Many USB-C charging cables carry only slow data, so a fast SSD tests slow on them. Use the drive's own cable or a proper Thunderbolt/USB4/high-speed USB-C data cable, then re-run the benchmark.","crumbs":[{"name":"Home","path":"/"},{"name":"FAQ","path":"/faq/"},{"name":"External drives","path":"/faq/external-drives/"},{"name":"Does the cable matter for my external SSD's speed?","path":"/faq/external-drives/does-the-cable-matter-for-an-external-ssd"}],"jsonld":{"@context":"https://schema.org","@type":"FAQPage","url":"https://storagestudio.us/faq/external-drives/does-the-cable-matter-for-an-external-ssd","inLanguage":"en","dateModified":"2026-10-01","mainEntity":[{"@type":"Question","name":"Does the cable matter for my external SSD's speed?","alternateName":["Why is my USB-C SSD slow with this cable?","Charging cable for external drive","Best cable for external SSD Mac","usb-c cable speed external drive","Speed test low but drive is fast","Thunderbolt cable vs USB-C cable"],"acceptedAnswer":{"@type":"Answer","text":"Yes, a lot. Many USB-C cables — especially ones that came with phones or chargers — only carry slow data speeds, so a fast SSD on such a cable tests slow. Use the cable that came with the drive, or a cable made for the drive's connection (Thunderbolt, USB4 or a 10 Gbps-or-faster USB-C data cable).\n\nAfter changing the cable, open Choose Drive (or Transfer Drive) and click Run benchmark to see the difference.","url":"https://storagestudio.us/faq/external-drives/does-the-cable-matter-for-an-external-ssd"}}]},"fragment":"
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External drives · Speed, cables and hardware

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Does the cable matter for my external SSD's speed?

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Short answer: Yes. Many USB-C charging cables carry only slow data, so a fast SSD tests slow on them. Use the drive's own cable or a proper Thunderbolt/USB4/high-speed USB-C data cable, then re-run the benchmark.

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Yes, a lot. Many USB-C cables — especially ones that came with phones or chargers — only carry slow data speeds, so a fast SSD on such a cable tests slow. Use the cable that came with the drive, or a cable made for the drive's connection (Thunderbolt, USB4 or a 10 Gbps-or-faster USB-C data cable).

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After changing the cable, open Choose Drive (or Transfer Drive) and click Run benchmark to see the difference.

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Last reviewed

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