text: if you mean Memory as in memory storage on drives then this is what i can help:\n\nC: is usally a main drive by default\nD-Z or more: is backup or any extra drive you have. or CD drives\n---------------\nif you have 2 hard drives(physicallly)\nmaybe you storing more files in D than in C.  check to see whats store in D and delete some.\n\nIf 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. \n\nBut 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) \n\nlet say you have 100gb Hard Drive\nbut 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 :)\n\n--------------\nsometimes 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. \n------------\n\nLook 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 :)