week 3 -secondary storage

when we built our PC, one of the most important thing we concerned is memory because it is the place to storing our data and it is also the bridge to the CPU. Now we already know we have different types of memory include ROM, POM, EPROM. Also ,we have three different storage way.Today I want to talk about some apply about the secondry storage.

secondary storage is not directly accessible to the CPU and is belong to the non -volatile memory that means they are premanent storage devices. The most usual secondery storge devices are hard disks, floppy disk, cd-rom.They are all good devices of back up the information.  Although sometimes we have backed up the data we can not make sure the system will never affected by the viruses. Then I think maybe the offline storage is the most safe way to back up the significant data on our PC.

off-line storage is a secondary storage and it can storage the data not under the control of the processing unit. Then we can unitilize this point to storage our data safely. But for a company it is critical that they have enough computer organzied memory so if they always depend on the off-line storage it will not working well in the end. so it is better  built a  company documents storage web site which uses the technology of cloud at the same time. Then they will never worry about the data can be loss.