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Interesting, not sure why that wasn't able to be changed. If you didn't already try this, you may need to adjust the alignment before you drag another partition from the source to the destination down next to it, which means you'd have to drag them one at a time rather than selecting "Copy selected partitions". Otherwise, maybe there's a special type code on that partition?
That said, alignment only really matters for performance when working with disks that use 4K sectors, and performance would hardly be a priority with the Dell OEM partition. The issue was that XP for some reason started partitions at sector 63, which isn't evenly divisible by 4, and because disks with 4K sectors still emulate legacy 512-byte sectors, this layout meant that reading/writing a 4K logical allocation unit (the default for NTFS) requires reading/writing two physical sectors on the disk. FAT32 defaults to 8KB logical sectors, so the issue exists there as well. This was fixed for Vista. But as long as your main partitions are properly aligned on a 4K boundary (the Vista style), then I wouldn't worry about it.