One  of  the comments I hear quite frequently from CP/M  (Kaypro) users 
    is  how  much better the Kaypro double-sided,   double-density  (DS-DD)  
    disk  format is than the MS-DOS  equivalent.    Not  true,  as most  of 
    these  comments  are based on the fact that a  Kaypro  DS-DD   diskette 
    holds  390k  of  files  while the MS-DOS diskette   holds  only   360k.   
    Comparing  one  format to the other on the  basis  of storage  size  is 
    like comparing apples and oranges.    The way CP/M puts  information on 
    the  diskette  is  quite different from  the  MS-DOS   approach.    The  
    difference  in storage size  is  due  to  a difference  in  the  number  
    of bytes per sector  and  number  of sectors (or clusters) per track.

    The   average  IBM-PC or clone can move a file in about  half  the time  
    it  would  take on a CP/M machine.    File transfers are   even  faster  
    when  done  between  sub-directories on a  fixed  (hard)   disk  MS-DOS  
    machine.    The  actual transfer speed is dependant on  the CPU   clock 
    speed,  the version of MS-DOS you're using,  and  also which  hard disk 
    controller you have,  but all things considered, it's still faster then 
    it's CP/M counterpart.

    When's  the  last time you copied a 160k file from one CP/M  floppy  to
    another in under 25 seconds?