Posted 19 June 2010 - 05:52 PM
Consider thinking about your question this way.
What follows is not "technically precise" but may offer a conceptual way to think about the topic.
When a user is composing or editing a text document, the document is considered "the file" that is being worked on.
It may be in file format .txt, .rtf, .doc, .dox, .pdf, .wpd, .odf, or one of many others.
For this discussion I will use .doc (from MS Word 2003)
If you "save" the document to a CD, what you get is:
the CD may also include "attributes" like "read-only" and date of creation/last saved.
But there is much more information about the .doc document as it resides on the user's computer.
Much more you say?
When working on a .doc document, it is "surrounded" by Microsoft Office Word, the application
Microsoft Office Word is "surrounded" by the Windows Operating System (win XP, Vista, Win7, etc.)
Windows Operating System is surrounded by BIOS Basic Input Output System instruction that tells it where to find the CPU, RAM, Hard Drive, optical drive, etc.
There is a comprehensive list of locations/maps plus required functions, called The Registry
The Registry gives a sort of "street map" to an application such as MS Word, telling Word where to find stuff, when it has to stop at an intersection, how to gain access to a printer, where to save a document, where to find a document that has already been saved, and how Word can interact with other application programs and the computer itself.
There is a user login repository (c:\documents and settings\username\... ) that keeps documents belonging to one user separate from documents belonging to other users, and also allows for specific user preferences, settings and such
There is a hidden Master Boot Record that instructs the computer were to find stuff and keep it sorted by boot.ini and environment, and make it possible to "turn on" the machine to view and work on a specific file.
Now remember from above... if you save the document.doc to a CD, what you get is "the saved file.doc plus a few attributes"
If however, you create a "drive image" (iso) of your C:\ ... You will definitely have "saved" your document.doc, but in the process of creating the Drive Image .iso, you will also have captured all the above information and more.
That might help when trying to understand what it means when the previous author refers to saving things byte by byte.
I can't truly speak for what those others meant by their words, but guaranteed they had in mind including much more than just the document.doc file.
If you are wanting to save your music files...
Save the files in their original format.
If you want to save a "backup"of your music files your can also use a compression utility such as Winzip, 7zip, rar, etc.
If you are wanting to create a CD that will play in your auto stereo, or a CD/DVD player, then you will have to read up on what file formats that specific hardware will accept.
Hope this helps a bit.
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