![]() Why misaligned partitions are the problem for SSD? Partitions aligned accordingly to 63 sectors start are not aligned with 4K sectors by default. ![]() There was no problem with this rule and partitions alignment in the home users segment before the appearance of mass 4K hard disk drives. But by legacy reasons all versions of Windows before Vista creates partitions according to this “cylinder alignment†rule. Instead, the Logical block addressing (LBA) scheme is used, where there is no any “cylinders†or “headsâ€, sectors are addressed continuously over a whole disk drive. It is an old compatibility issue and all modern operating systems do not use this archaic CHS (cylinder/head/sector) addressing scheme. ![]() Usually the partition start is indented on 63 sectors, because it is an old measure of a disk “cylinder†and some old versions of DOS or Windows demand that the partition has to be aligned to the “cylinder†for correctly sectors addressing and accessing. Thus another level of abstraction is being added. This emulation is needed for oldsoftware compatibility. Modern hard disk drives, for example Western Digital, Seagate, etc., have an interna4096 bytes physical sector size, their logic operates 4K chunks of data, but for outside hardware andsoftware they appear as “traditional†drives with 512b sectors. ![]() Partitions can be misaligned because the physical sector size is not 512 bytes and software does noknow about it. Why misaligned partitions are the problem for hard disk drives?
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