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[solved] GUID partition table: 4K vs. 512-byte sectors; can I do both?

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https://bbs.archlinux.org – OK, not quite solved, but sort of. Further reading on GPT reveals that it is NOT safe to attempt this, because the backup GPT location is also specified in relative LBA numbers -- starting at highest LBA - 32 or so, which is indeed encroaching on the tail end of a partition. GPT alignment in gdisk/cgdisk does not leave a margin that big at the end of the disk; it always goes to highest LBA - 32 for whatever sector size you're working in.I found a workaround, though -- I used fdisk (not gdisk) to create an old-style MBR partition table on the front of the disk. Since that only alters the f (HowTos)