![]() ![]() Thus, the firmware of these newer devices may expose a logical sector size, which is either 4KB Native (4Kn) or 512B Emulation (512e). Not all OS versions have been modified to utilize 4KB sectors in the disk drives. The disk sector size is an important factor in the design of an Operating System and Hypervisor (collectively called OS here) software such as device drivers and file systems, because it represents atomic unit of I/O operation on a disk drive. ![]() 512e has physical sector size of 4k and it emulates 512 bytes’ sectors. The main difference between 512n & 512e is around sector sizes on the drive. Going forward, most of high capacity drives are likely to be Advance Format * (AF) drives according to drive vendors and OEMs. 512e drives are only supported starting with VMFS6 and vSAN 6.5 and they are not supported with the previous VMFS or vSAN versions. This helps with density optimized vSAN clusters if the customer so chooses. ![]() It is a feature that would allow customers to use large capacity drives with vSAN. VMware vSphere 6.5 along with vSAN 6.5 now support 512e format. This blog was co-authored by Sumit Lahiri
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