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I have a question. The speed of my Disk is about 450 Mb/s read and 150 Mb/s write. (maybe because the disk structure of Catalina is with a virtual partition as read only, I do not know) Model Name: MacBook Pro 17” Early 2011Model Identifier: MacBookPro8,3Processor Name: Quad-Core Intel Core i7Processor Speed: 2.2 GHzNumber of Processors: 1Total Number of Cores: 4L2 Cache (per Core): 256 KBL3 Cache: 6 MBHyper-Threading Technology: EnabledMemory: 16 GBBoot ROM Version: 87.0.0.0.0SMC Version (system): 1.70f5Sudden Motion Sensor:State: Enabled FYI: I did enable TRIM on the SSD
Your system offers two SATA ports: The HDD port offers SATA III (6.0 Gb/s)The Optical drive offers SATA III (by hardware report) but due to a timing issue within the logic boards PCH you can only use a SATA II (3.0 Gb/s) drive. Which port are you using for your SSD? As well as who’s and its model and size. Update (07/03/2020) To start with I don’t recommend APFS on SATA drives (HDD or SSD) the issue is the what SATA works Vs PCIe. SATA only has four buffers whereas PCIe has 16 or 32 buffers! Depending on the number of lanes x2 or x4 the drive offers. So… The best thing we can do is backup your stuff and reformat the drive using macOS Sierra (10.12.x) while it can support High Sierra you’ll need to modify the OS installer so it does not convert the drive from HFS+ to APFS as it will magically do that without telling you! Is It Possible Not to Convert to APFS When Upgrading to High Sierra. Going anything higher it is no longer an option to stick with HFS+ Frankly, I would stick with Sierra as there are other issues within High Sierra that could mess you up. Now the kicker! Apple messed up the OS installer files If you’ve got an old macOS install image, it will probably stop working today You’ll need to boot up under an external drive to remove the partitions and reformat the drive with GUID Journaled file system (HFS+) Here are the fixed installers: How to upgrade to macOS SierraHow to upgrade to macOS High Sierra Jump to Step 4 make sure you grab the correct URL its the second one in the section. Create a bootable OS installer using a USB thumb drive, following the correct instructions here: How to create a bootable macOS Sierra installer driveHow to create a bootable macOS High Sierra installer drive
