The drive controllers in the USB-C MacBook present native 4096 bytes (advanced format) logical sectors to the operating system rather than 512 bytes. Hard drives have had physical sector sizes of 4096 bytes for many years, but the controllers in these drives present logical sector size as 512 bytes in emulation (512e) to support older computer hardware and operating systems. The Master File Table (MFT) on the internal drive also uses a larger segment size than the older drives.*įor several years, hard drive manufacturers have been transitioning drives from 512 byte sector size to 4096 byte sector size. Previous MacBook and MacBook Pro models use 512 byte emulation even though the physical sectors are 4K. However, this mean that file systems and drivers must be block size-aware. Larger block size means that large files can be written faster, since more data can be written at one time. The USB-C MacBook and MacBook Pro models have drives that use native advanced format 4096-bytes-per-sector drives. Image Compatibility between older Macs and 2016 Macbook Pro and USB-C MacBook Winclone 5 customers intending to migrate Boot Camp from an older Mac to the USB-C Mac models like 2016 MacBook Pro or 2015 Mac Book should be aware of an incompatibility between the drive block size (see full article below) that prevents successful Winclone migration in Winclone 5.
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