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<blockquote data-quote="PGB1" data-source="post: 1951166" data-attributes="member: 76746">Hi All!After researching external drives for my MacBook Air M4 with Thunderbolt 4 ports, I saw many fine print notes on manufacturers' pages saying that the listed Read &amp; Write speeds can't be achieved on Macs with Thunderbolt 4 ports. Reading general on line articles gave, like usual, conflicting information. Here are the questions for which I can't find a definitive answer:A) For Time Machine, I'd like a reasonably fast drive in case I ever re-purpose it. Several drives advertise 1050 Mbps Read, 1000 Mbps Write with USB-C 3.2 Gen 2 interface. Some say Nvme. But, many say that Mac with Thunderbolt 4 won't achieve those speeds.With a USB-C cable into the Mac's Thunderbolt 4 port, will this drive achieve 1050/1000 or will it fall back to a slower speed? Some sites say it will fall back as slow as 50 Mbps on a Mac with Thunderbolt 4.B) For a drive to use as an external, general use drive; to achieve full Thunderbolt 4 speeds, am I correct to get the following:Drive stated as Thunderbolt 4, 40 Gbps or higherCable stated as Thunderbolt 4What speed can be expected?&nbsp; Is 40 Gbps maximum correct?Thank You For Clearing Up Much Confusion! Your help is appreciated.Paul</blockquote>

[QUOTE="PGB1, post: 1951166, member: 76746"] Hi All! After researching external drives for my MacBook Air M4 with Thunderbolt 4 ports, I saw many fine print notes on manufacturers' pages saying that the listed Read & Write speeds can't be achieved on Macs with Thunderbolt 4 ports. Reading general on line articles gave, like usual, conflicting information. Here are the questions for which I can't find a definitive answer: A) For Time Machine, I'd like a reasonably fast drive in case I ever re-purpose it. Several drives advertise 1050 Mbps Read, 1000 Mbps Write with USB-C 3.2 Gen 2 interface. Some say Nvme. But, many say that Mac with Thunderbolt 4 won't achieve those speeds. With a USB-C cable into the Mac's Thunderbolt 4 port, will this drive achieve 1050/1000 or will it fall back to a slower speed? Some sites say it will fall back as slow as 50 Mbps on a Mac with Thunderbolt 4. B) For a drive to use as an external, general use drive; to achieve full Thunderbolt 4 speeds, am I correct to get the following: Drive stated as Thunderbolt 4, 40 Gbps or higher Cable stated as Thunderbolt 4 What speed can be expected? Is 40 Gbps maximum correct? Thank You For Clearing Up Much Confusion! Your help is appreciated. Paul [/QUOTE]

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