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#51
It is not the recovery partition that is important, it is the EFI partition (100MB partition) that is the primary problem. The recovery partition I suggested to be deleted because it's a literal waste of space as it's not used because of the recovery partition on the other drive. This waste is tiny though and nothing of concern unless the 1GB could be used.
Do you have a backup of the data on the D drive? You can convert the drive to a basic drive, there are tutorials online that guide through the process of converting without data loss, but I would not try it without a backup first. I've needed to convert a dynamic partition once, it went well because I took precaution as the built-in tools I believe do not allow for this conversion without data loss. The tools you have should allow for conversion without data loss, but again I recommend a backup prior attempting it.