Yes, a hard disk is much greater than a CD.
Yes we can run. The operating system does it by means of a mechanism called Virtual Memory. It shows THE FREE SPACE OF HARD DISK as main memory. So if the application size is greater than the size of free space of hard disk then it could not be run in that system. For further reading read Virtual Memory topic in any Computer architecture or organisation book.
no the floppy disk rotate slower its because hard disk rotate faster then floppy disk
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Definitely an External hard disk is better than the flash memory because of it's stability.
Usually much faster
Because of black Jesus
A modern hard disk will spin much faster than a floppy disk. A floppy disk will spin at around 300 RPM. A hard disk will vary depending on model and configuration. A mid range desktop hard disk will spin at around 7200RPM. Laptop hard disks usually run at slower speeds of 5400RMP. High end desktop and server hard disks can spin at speeds in excess of 10000RPM.
Zip disks can hold 100 megabytes. Today's hard drives usually hold 250 gigabytes, smaller ones are around 100 gigabytes, and large ones are upwards of 500 gigabytes. One gigabyte is 1000 megabytes, so the typical hard drive can hold 2,500 times more than a zip disk. To answer the question in one word, no.
CD is better than harddisk because CD can be carried anywhere but hard disk can not
The best way, I think to answer that is to define what a computer (or in this case the motherboard of the computer) needs to find or identify a hard disk. A hard disk needs a power source, a connector to attach it to the motherboard, and a controller to talk to the microprocessor of the computer. If any of these things fail the hard disk will not function and the computer will not recognize it. In general when you see the message "hard disk not found" its because the computer can't recognize the hard disk. This can be from a bad cable (that connects the hard disk to the motherboard), no power to the hard disk, or a failed controller. In my experience, its usually a bad cable but there are times when the hard disk itself will fail. Generally, hard disk cables are far more fragile than hard disks.