text: question about checking how much memory is being used on my computer? i checked today to see how much memory is being used on my computer.  why is  a lot more memory being used in my d drive than my c drive? and is this normal? if you mean memory as in memory storage on drives then this is what i can help:  c: is usally a main drive by default d-z or more: is backup or any extra drive you have. or cd drives --------------- if you have 2 hard drives(physicallly) maybe you storing more files in d than in c.  check to see whats store in d and delete some.  if c is your not your main drive, inwhich the windows folder is located in your d drive, then this is not normal and can lead a lot of 3rd party software errors.   but wait what if you only have one drive( that means one drive but windows says you have 2 hard drives) and you system spec stats only one hard drive. the computer manufactor must've partition it to make a backup drive.(really commom theses days)   let say you have 100gb hard drive but when you check it i'ts only 90gb on c and  d has 10 gb (roughly). that usally a partition. it takes some storge from one and makes a new one :)  -------------- sometimes when computer that you buy from stores has a drive for the restore image so that when you computer goes bad, you can reformat and it comes back to life. so this drive is used as a backup and mainly should not be  touch with.  ------------  look at the size ratio if c is only 100gb and d is 4gb thats usally a partition. and your c is 80gb free while d is 1gb free. that usally a system factory img store in there. if its like tis then yes your system is normal :)