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SanDisk Professional Pro-Blade review: Fast, but an answer to a question nobody is askingBecause I and some colleagues were so curious about the possibility of M2 supporting 20Gbps USB Gen 2x2, I actually got ahold of a Sandisk Extreme PRO Gen 2x2 SSD V2 (1TB) which advertises 20Gbps speeds, and took it to the Apple Store today. Sadly, I found the M2 Max MBP 16" only showed 10Gbps speeds on this Gen 2x2 SSD.
I trust Mike's results on the PRO-BLADE Transport that showed 20Gbps speeds, so I wonder if the USB chip in the Transport reader is more of a USB4 chip, compared to the chips used in the older Extreme PRO V2 drive from 2021? Another reviewer actually claimed 30Gbps speeds with the PRO-BLADE on an M2 Air, which is strange but might lend credence to the USB4 hypothesis... (unless they accidentally tested their internal SSD rather than the PRO-BLADE like I accidentally did in one of my test runs today!)
In any case I'd have to agree with Mike that Gen 2x2 remains a bit of a mess, and focusing more on USB4 (not to mention Thunderbolt) seems ultimately for the best.
Testing methodology: Sandisk Extreme PRO V2 1TB purchased 2/19/23 from local Best Buy store, model # SDSSDE81-1T00.
Cables: both included Sandisk USB-C cable (unmarked), and OWC 0.7m Thunderbolt 3 Passive Cable CBATB-002-070A.
Computers: M2 Air 13" 8GB, M2 Pro MBP 14" 16GB, M2 Max MBP 16" 32GB, all on macOS Ventura 13.2.1 at the Apple Store.
Testing Apps: Amorphous DiskMark 4.0(41) and Blackmagic Disk Speed Test 3.4.2, both with default settings.