It was common on the ST to use extended formatting of disks, i.e. more than 80 tracks and more than 9 sectors /track. Also common on early STs were singlesided drives, and many games came on singleside disks to be compatible with older STs. Also early ST's formatted floppys with the catalog on another track than MSDOS, som compatibility was one-way. The floppy drive you bought would likely be able to read most ST disks, but windows doesn't, you need a special program, that allows raw access to the drive.
UK 1040 STF, SE kbd, SE tos 1.04, gotekHxC+floppy B internally, ATX psu on the side
DE Mega 1
SE Mega 2, no keyboard
SE Mega ST 4
Megafile 20 with 2 MFM drive mechanisms (80+20 meg) in hacked case, ATX psu on the side
SM124, SM125, finlux 19 inch TV RGBscart
PC Intel i5 8G ram many disks