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If you think back to the old days of business systems that used a mainframe computer and a number of terminals that had limited computing power and very limited memory and no storage ability - cloud computing is similar to that method.
The cloud is the memory capability of the internet that has been used for the storage of files uploaded from personal computers for several years. Such files can be accessed from anywhere by many machines by anyone with access. This has been a great service to international business but only a tiny fraction of the storage capacity has so far been used.
Today there are a new breed of machine designed primarily for cloud computing, the Google Chromebook is one example...
There are limits to what the calculator can display in symbolic form, and roots beyond the second (square roots) are beyond its capabilities. Even something as simple as the cube root of 2 will be displayed numerically.
It's the same thing, it 'expands' your storage and basically gives you more space to store thing. It's an advertising thing. You cannot expand whats inside your computer, that would require you to replace the hard disk itself. It's just a word they put in to make their product more attractive I believe.
On non-smart phones with limited onboard memory they limit the ringtones to 10 seconds for a reason. If it was longer it takes more onboard memory which slows the complete functionality of the phone. If this is something you were very interested in look for a smart-phone with SD capable storage expansion. I would look for an HTC/Blackberry/iPhone as they are dedicated MP3 players as well as capable to have ringtones longer than 10 seconds. I use MP3 Direct Cut to cut my ringtones manually and for those 3 devices they all have app stores to cut and crop your ringtones to size. If this phone is capable of doing it, the file might be too big, try lowering the quality of the mp3 by using Winamp/Windows Media Player.
Yes this can be done and the only limit on size is the drive size. The current max size for mainstream drives is around 2TB so make sure the adapter will host more then one SATA ports as at least 2 drives will be required.
Also make sure the adapter card will work with the Operating System as many are designed to be used under Windows only so if you are running Linux or BSD, there may be no support. The other limit is the fact that the PCI is not a fast bus by current computer technology standards. If there are additional PCI devices such as network interface cards, integrated graphics, modems, soundcards, game controller adapters, USB expansion ports, Firewire expansion ports, etc.. theses devices will all be sharing the bandwidth of the PCI bus, leading to slow read and write performance of the additional storage.
If you are adding these drives to have fast storage, I suggest saving the money for a new system that makes use of current technology.