unit(A measurement that specifies in what quantity a product will be sold); drive(An area of storage that is formatted with a file system and has a drive letter. The storage can be a floppy disk, a CD or DVD, a hard disk, or another type of disk)
units(The quantity of a resource assigned to a task. The maximum units is the maximum number of units available for the resource. For example, if you have three plumbers, the maximum units is 300 percent or three plumbers working full-time)
