You're going to tell me that one time you took an entire box of DSDD disks and formatted them at 1.2MB on an AT and it all worked perfectly.
You can format a HD disk to 360K or a DSDD disk to 360K.
So finally I formatted a box of DSDD disks, one each on ten different drives in the library.
So when someone complained about the drive, I'd trot out with my box of ten formatted DSDD disks in case I had to "prove" our drive worked.
Because we were moving in the direction of AT machines, we had stopped purchasing DSDD disks in such vast quantities.