3 Softwares & 3 Different Size Output of Same CD?

[gonwk]

Hi folks,

I need some of the experts' explanation here ...

I was testing these 3 Softwares ("Alcohol Soft" - "BlindWrite" - "CloneCD")
to see which is best. All Trial Versions but they say they are the same as Full version except have 15 day or 21 day Trial period. btw, I used the most current versions.

I backed up the CD as an Image ... each Software provides it's own Format (for example: .ccd, or .B6I, ...) with the Exception of "Alcohol Soft" that permits you to back up to any of the Formats ...even to the Competitors format ...so right off the back I say "Alcohol Soft" WINS since gives you the most Flexibility with Formats.

Here is my Question ... WHY would I get different size Image output with all these 3 softwares?

I used all 3 softwares in their Default Mode!

Alcohol Soft:
Image1.iso ------- 476,282 KB

CloneCD:
Image1.ccd ------- 1 KB
Image1.img ------- 546,981 KB
Image1.sub ------- 22,326 KB
So Total = 569,308 KB

BlindWrite:
Image1.B6I ------- 569,665 KB
Image1.B6T ------- 1 KB
So Total = 569,666 KB

Why would "Alcohol Soft" (btw I tried the 52% version) output be so much lower than the other two. But for your info all 3 have the same data on them I checked them.

So ... that is where my confusion is!!!

Thanks,

G!

[doctorhardware]

Is there some type of compression being used?

[paglamon]

G!
See here(post 4):http://club.cdfreaks.com/f43/iso-vs-pxi-64959/

[gonwk]

G!
See here(post 4):http://club.cdfreaks.com/f43/iso-vs-pxi-64959/

Hi Paglamon,

I don't know How you do this ... Pulling Rabbits out of your Hat!!!
THANKS Pag, YOU are the MAN ... right on the Traget.

Q: Pag ... If I want an "Exact Copy" Image of the CD (my deteriorating CD) ... then which one which you be using!?!?

Thanks again,

G!