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a). The main types of primary and secondary storage:
Primary storage is the only one directly accessible to the CPU: random access memory (RAM) - loses the information when not powered. Also there are storages located inside the processor: very fast and small Processor Registers and Processor Cache.
Secondary storage is not directly accessible by the CPU. Secondary is non-volatile (doesn't lose the data when the device is powered down web design). Examples: hard disks, floppy disks, magnetic tape, paper tape, flash memory.
b). I would like to compare: HDD and CD.
A typical desktop HDD, might store between 120 and 300 GB of data and have a media transfer rate of 1 Gbit/s (or higher). HD 200 GB costs about $180 (1MB costs about $0.0009, web design). A typical CD-ROM, might store 600 MB of data and have a media transfer rate of (52x) 62 Mb/s (depends also on speed of CD-ROM Drive). One single CD-ROM costs about $0.30 (1MB costs about $0.0005).
As we see, a difference between these two storage media are huge, but price per MB is very similar. That is why nowadays CD-ROMs are becoming to be less and less useful.
Primary storage is the only one directly accessible to the CPU: random access memory (RAM) - loses the information when not powered. Also there are storages located inside the processor: very fast and small Processor Registers and Processor Cache.
Secondary storage is not directly accessible by the CPU. Secondary is non-volatile (doesn't lose the data when the device is powered down web design). Examples: hard disks, floppy disks, magnetic tape, paper tape, flash memory.
b). I would like to compare: HDD and CD.
A typical desktop HDD, might store between 120 and 300 GB of data and have a media transfer rate of 1 Gbit/s (or higher). HD 200 GB costs about $180 (1MB costs about $0.0009, web design). A typical CD-ROM, might store 600 MB of data and have a media transfer rate of (52x) 62 Mb/s (depends also on speed of CD-ROM Drive). One single CD-ROM costs about $0.30 (1MB costs about $0.0005).
As we see, a difference between these two storage media are huge, but price per MB is very similar. That is why nowadays CD-ROMs are becoming to be less and less useful.