Add punctuation: Convenient storage compartment on the front
A: Convenient storage compartment on the front.

Add punctuation: USB flash memory Floppy disk in the case of using optional USB floppy disk drive FD01A
A: USB flash memory, Floppy disk (in the case of using optional USB floppy disk drive FD-01A)

Add punctuation: A very large gaming companies have not had their game selection and still managed because they are and have been so big in the industry for a long time
A:
A very large gaming companies have not had their game selection and still managed because they are and have been so big in the industry for a long time.