These memory modules vary in size, type and capacity according to the computer on which van placed either a computer Lap top or desktop, these modules are placed on the memory banks with which has the card mother, the size of these banks of memory may be of the type DRAM, SDRAM, SIMM, SDR, DDR Etc., (worth mentioning that this computer area must be handled by qualified support personnel as it may cause damage if its handling – not mastered already in another theme will play to fund something about the maintenance and updating of computers, now only as a reference), these modules have some capacity that has been on the rise, you remember the Kb, Mb, Gb, TB in this part of the computer capabilities currently GigByte capacities are handled in forward although there are also still many computers with lower capacities and similarly this kind of memory modules work in multiples of 2; i.e. in the first computers had modules with capacities in Kb after with the arrival of the Megabyte had modules of 32, 64, 128, 256, 512 makes the leap towards the Gigabyte and arrive modules 1, 2 and so on. Capacity of storage units storage devices where the user interferes directly are a variety and are used to store data and information in order to be used for processes whether at the moment, use future for consultation or simply storage and backup. Continue to learn more with: translation software. Storage devices can be of type magnetic, optical and chip type and these are: Flexible storage magnetic disk (Flopy Disc): magnetic storage. Although increasingly these disused for a long time were indispensable and they evolved in several stages, floppy disks could be found with measures of 8?, 5.25 and 3.5? with capabilities ranging from 360 Kb, 740 Kb, 1.44 Mb with the passage of time and the emergence of new devices have been practically forgotten. .