I only achieve 300MB/s read/write speed on my Macbook Air, M1 2020 via Usb-c. (Practically the same speed as a T5...). Does anyone know why I can't reach 1000MB/s?

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Samsung Electronics GmbH 
Hello,
Thank you for your enquiry.
The Samsung Portable SSD T7 - 2 TB - Grey MU-PC2T0T/WW has a sequential read speed of up to 1,050 MB/s and a sequential write speed of up to 1,000 MB/s. Please note that the performance may vary depending on the host configuration. To achieve the maximum read and write speed, both connected devices and connection cables must support the 2nd generation of USB 3.2 and UASP mode must be enabled.
If in doubt, please contact Apple customer service.
Best regards from Schwalbach
Your Samsung Service Team

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1. is the hard drive formatted with Exfatt? 2. is a fast data cable, preferably Thunderbold, connected?

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EDIT: My T5 is even faster, 350MB/s!

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EDIT: my T5 is even faster! 350MB/s

Your data. Your choice.

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I only achieve 300MB/s read/write speed on my Macbook Air, M1 2020 via Usb-c. (Practically the same speed as a T5...). Does anyone know why I can't reach 1000MB/s?