![]() Mentioned several times over the years (including a note on my 2nd SSD swap in a 2012 Mac Mini) but after seeing a recent post in Apple's forums from a 2009 Mac Mini (mini3,1) owner that his new Samsung 840 EVO SSD shows a 1.5Gbps link rate (despite having a SATA2/3Gbps interface), wanted to post a reminder on the Mac models that have this problem.ĭIY OS X Fusion Drives in Mac Pros, MacBook Pros, iMacs & Mac Minis Reminder on SATA2 Macs that Run SATA3 (6Gbps) Drives at SATA1 Speed (The listed PMSET mods to avoid hibernate mode were used with a desktop mac then - not a notebook that needs to hibernate when its battery runs low.) Originally written after what i saw with a new 2012 Mac mini, but the linked apple article notes specific late 2012 and later models affected. Includes reason why (a 'feature' first added in OS X 10.8.2 supplemental update 2.0, for compliance with EU Energy standards) and includes some PMSET mod tips that have worked (at least for some users - ymmv). Info and Tips on why 2012 and later mac mini, iMacs, (and notebooks) shut down after hours in sleep mode. Why Macs Power Off after Hours of Sleep (Hibernates/Turns Off) (He includes a summary list of hardware components and software used, as he did with his previous video and system benchmarks.) A must read for anyone using an APFS format boot Hard Disk Drive.ĭisk Benchmarks with NVMe SSD Upgrade vs SATA III SSDīill sent Disk Benchmark scores of an NVMe Samsung 970 PRO 500GB SSD Upgrade vs previous Crucial M500 SSD in his mini-ITX Hackintosh. Hibernate was originally designed as a safety feature for Laptops on battery power.)Īnalysis of APFS Performance on Rotational Hard DrivesĬarbon Copy Cloner article with detailed analysis of APFS enumeration performance on rotational hard drives (vs SSDs) that explains the much slower performance of APFS formatted HDDs vs SSDs, and how that performance degrades quickly. (There's a post/note below from 2013 on "Why Mac Powers Off after Hours of Sleep - Hibernates/Turns Off", where even later desktop Mac models go into Hibernate after hours of sleep. (Some Macs after sleeping for several hours go into Hibernate mode, where the macOS system state is written to the drive.) The workaround noted is to enter this command in the Terminal App: ![]() An OWC support page listed a workaround for Kernel Panics seen when waking from deep sleep "Standby Mode". Reports on some Macs with NVMe SSDs Crash on Wake from Sleep/Standby Mode in macOS Catalina. Failure code: 0xffffffff 0x0000001f" (macOS Catalina) One example is the Highpoint SSD7101A."Ĭrash Report shows " Sleep Wake failure in EFI. The teams also found other cards, which, when installed, result in a kernel panic. If OWC Accelsior 4M2 is in any other slot, or if it is configured to use pool A, no kernel panics occur. More importantly, we figured out that the problem only occurs when the OWC Accelsior 4M2 is installed in slots 4 or 5, and only if those slots are configured to use pool B of the PCIe lanes. (OWC comment) "We determined that the kernel panic occurs when the 2019 Mac Pro sleeps. Tip to Prevent Kernel Panics with SSD PCI Card Includes Amorphous Disk Mark, Blackmagic and AJA Disk Speed test results, notes on RAID 0 performance, and other overall System benchmark scores. ![]() Review with benchmark speed tests of a bootable Dual NVMe SSD PCIe Card using Samsung 970 EVO M.2 500GB Blades in a Mac Pro 5,1 running macOS Mojave. I/O Crest Syba Dual M.2 NVMe SSD PCIe card in Mac Pro 5,1 with Mojave SSDs/Hard Drives | Controllers/Adapters | RAID | Blu-Ray/DVD/CDRWs | Tips/Misc = Link Category List - Click to jump to that Topic Section = for Mac Free Carbon Copy Cloner For Mac Os 10.6.Mac SSD/SATA/IDE/ATA Storage/Controller Articles, Updates and Tips Mac SSD, NVMe, HDD and Controller Articles, Tips and Reviews System Requirements for Carbon Copy Cloner 5 for macOS Copy Carbon Cloner For Macĭownload Carbon Copy Cloner 5.
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