Results given are those for Theil-Sen regressions. If anything, that could result in overestimation of the read rate.
SOHO NOTES EL CAPITAN MAC
The procedure detailed as the ‘Gold Standard’ test was followed, without restarting the Mac between the write and read tests.
SOHO NOTES EL CAPITAN SERIES
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.
SOHO NOTES EL CAPITAN FULL
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. 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)”.
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