![]() When connected to an Intel Mac using a USB-C cable, connection speed was given as 10 Gb/s, with typical read rates of 470 MB/s, and write rates of 480 MB/s. markelp and other users have reported similar results using other widely available benchmarking apps. On relatively slow SSDs, dispersion is narrow and reproducibility excellent. Results given are those for Theil-Sen regressions. If anything, that could result in overestimation of the read rate. ![]() The procedure detailed as the ‘Gold Standard’ test was followed, without restarting the Mac between the write and read tests. Transfer rates were measured using my free app Stibium, version 1.0 (55), which wrote a total of 160 files of sizes from 2 MB to 2 GB in size to a folder on the SSD being tested, and read those same files back (Series Write and Series Read Tests as detailed in Stibium’s Help reference). Again, each was verified by establishing SuperSpeed+ 10 Gb/s connections to an Intel Mac.Ĭonnection speeds were read from the SSD’s entry in the USB data given in System Information. Each was connected to an Intel Mac (including an iMac Pro) and it was verified that they established connection at SuperSpeed+ 10 Gb/s with those Macs.Ĭables used included a certified Thunderbolt 4 model, and the USB-C (data) cables provided with the cases. In personal testing, these were mounted in basic UGREEN and similar cases claimed to be compatible with USB 3.1 Gen 2. Additional results used were obtained on other M1 models.Ī range of different external SSDs was used, using Crucial and Samsung SATA SSDs. Apple MacBook Pro 16-inch, 2021 with M1 Pro, 32 GB memory, 2 TB internal SSD, using its internal display.īoth were running macOS 12.3.1 in Full Security mode, with no extensions which might affect USB or Thunderbolt transfer speeds.Apple Mac Studio with M1 Max, 32 GB memory, 2 TB internal SSD, connected to an Apple Studio Display.Personal testing was performed using two M1 models It’s common wisdom that external USB-C devices can normally be connected to USB-C format ports, including those capable of Thunderbolt 3 or 4, using either a USB-C (data) cable, or a Thunderbolt 3 or 4 cable. In normal testing, 5 Gb/s should yield around 500 MB/s, 10 Gb/s gives around 1200 MB/s, and 20 Gb/s about 2400 MB/s. The raw transfer speeds given aren’t achieved in practice, because of encoding and other overheads. USB 3.2 adds two-lane SuperSpeed+ at 10 and 20 Gb/s.Ĭurrently, Apple makes no claims that any ports on its M1 models support USB 3.2, only the more widespread USB 3.1 Gen 2 standard.USB 3.1 Gen 2 adds SuperSpeed+ at 10 Gb/s.USB 3.0 onwards supports SuperSpeed USB at 5 Gb/s.For the purposes of this article, I’ll gloss over a lot of detail and summarise the relevant features as: ![]() Unfortunately, standards and terminology for USB 3.x are confusing. This article examines why performance experienced by users falls short of Apple’s claim. However, many users have reported performance which doesn’t reach 10 Gb/s for directly connected external disks. Usually commercial software or games are produced for sale or to serve a commercial purpose.Apple claims that all its new models using M1 series chips come with Thunderbolt ports which support “USB 3.1 Gen 2 (up to 10Gb/s)”. Even though, most trial software products are only time-limited some also have feature limitations. After that trial period (usually 15 to 90 days) the user can decide whether to buy the software or not. Trial software allows the user to evaluate the software for a limited amount of time. Demos are usually not time-limited (like Trial software) but the functionality is limited. In some cases, all the functionality is disabled until the license is purchased. Demoĭemo programs have a limited functionality for free, but charge for an advanced set of features or for the removal of advertisements from the program's interfaces. In some cases, ads may be show to the users. Basically, a product is offered Free to Play (Freemium) and the user can decide if he wants to pay the money (Premium) for additional features, services, virtual or physical goods that expand the functionality of the game. This license is commonly used for video games and it allows users to download and play the game for free. There are many different open source licenses but they all must comply with the Open Source Definition - in brief: the software can be freely used, modified and shared. Programs released under this license can be used at no cost for both personal and commercial purposes. Open Source software is software with source code that anyone can inspect, modify or enhance. Freeware products can be used free of charge for both personal and professional (commercial use). Freeware programs can be downloaded used free of charge and without any time limitations.
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