Every so often I hear people say, that you must align partitions on SSDs, just as on advanced format hard drives, because "AS SSD" told them so. And people who heard that tell other people the story and so on. And we have created an urban legend.
But is that really the case?
All my SSDs (Samsung, SanDisk) tell me, that they use physical sector size of 512 bytes. They have a valid configuration word 106 (bit 14 is set) which bit 13 set to zero (1 = Device has multiple logical sectors per physical sector). So it's unlike the early WD AF models, which just had no valid word 106.
The sector layout is completely abstracted from the underlying flash anyway, regardless of page size and erase block size, so there should be no read-modify-write cycles like on AF HDDs. SSD vendors don't tell people anything about alignment. So is that really an issue? Or just hearsay?
We also have SSDs with controllers compressing data, so there can't be a real 4K-sector flash-page relation anyway.
(Of course, you can align partitions preemptive "just to be safe", but that was not the question, I want factual data and clear examples of modern SSDs, which require alignment).