![]() ![]() There are methods to prevent the auto conversion to APFS installing High Sierra and use HFS+ as the file system on a third party SSD, but they are not recommended. It does not matter if the 3rd party drive is faster or may even be built better, with more advanced componentry (nand Flash etc), if the firmware on the drive is not recognized as Apple, cannot interface with the APFS firmware in the same manner as a OEM Apple SSD, there will be issues using the drive, Unless the file system is modified by Apple to work properly with a third party drive(s) in the future. ![]() Since High Sierra auto converts a SSD's to APFS upon installation, using a 3rd party drive may render problems noted above. Apple does not manufacture their drives in house, but there is talk that they may, or have, purchased Toshiba's Chip business, which would lead to drives for their machines being solely being controlled (manufactured) by Apple for the future. Apple does not sell their drives to the public directly. The MacBook Pro 'Core i7' 2.9 13-Inch (Mid-2012/USB 3.0) features a 22 nm 'Ivy Bridge' 2. If any third party drives are used as replacement or upgrade and the APFS file system is used, there will be possible data integrity issues and Trim may not work properly. Apple SSD drives have specific code in their firmware that is designed to work with the new APFS files (SSD's), The older SSD's that were proprietary (connection was apple specific) probably do not have up-to-date firmware to work properly. ![]()
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