It looks like I will have to change my Samsung EVO 970 Plus to Sabrent Rocket quite soon (but in DriveDX everything is fine, only 23TB has been written and SMART is perfectly fine). ![]() Write speed is 2700 MB/sec and read speed is 2069 MB/sec. I also noticed that a write/read speed in macOS is also degraded! From the DriveDx FAQ: External NVMe (M.2) SSDs support Currently, there is no NVMe SMART over USB drivers for macOS. Now I have 2 APFS containers: one for Mojave 10.14.6 and another for Big Sure 11.1.Īnd time required to boot from OpenCore to login screen is doubled! 18:11:14.999496+0100 localhost kernel: (apfs) spaceman_trim_free_blocks:3383: disk2 11033936 blocks trimmed in 20225 extents (500 us/trim, 1998 trims/s) If you notice, macOS doesn’t support the SCSI pass through nor does smartmontools support SCSI. Depending on self-test type it does read. Usually self-tests consist of a collection of test routines like electrical and/or mechanical performance tests as well as the read performance test of the drive. The primary goal is to quickly identify if the drive is faulty. 18:11:14.999473+0100 localhost kernel: (apfs) spaceman_trim_free_blocks:3375: disk2 11210158 blocks free in 86549 extents DriveDx allows you to start and control diagnostic self-tests of SSD / HDD. 18:11:03.134051+0100 localhost kernel: (apfs) spaceman_datazone_init:442: disk2 allocation zone on dev 0 for allocations of 4 blocks starting at paddr 983040 18:11:03.134045+0100 localhost kernel: (apfs) spaceman_datazone_init:442: disk2 allocation zone on dev 0 for allocations of 3 blocks starting at paddr 1015808 ![]() ![]() 70 is a significant difference for SMART. 18:11:03.134039+0100 localhost kernel: (apfs) spaceman_datazone_init:442: disk2 allocation zone on dev 0 for allocations of 2 blocks starting at paddr 1048576 While the least expensive TB shell I know for NVMe is the OWV Envoy Express TB3 which is 90. Majority of USB-C enclosures such as YOURS, are based on NVMe technology, for which there is no ISO/ANSI standard driver support to query SMART status for NVMe/M.2 over USB. 18:11:03.134032+0100 localhost kernel: (apfs) spaceman_datazone_init:442: disk2 allocation zone on dev 0 for allocations of 1 blocks starting at paddr 1081344
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