Solved

Storage of files onto a DVD-R or CD-R

Posted on 2014-12-01
7
230 Views
Last Modified: 2014-12-01
Hi,

I'm trying to work out how many files of a certain size I could fit on a CD-R or a DVD-R.  The images are all scanned.  I found the following equation which helps estimate the size of a scanned document:

Resolution (X) x Resolution (Y) x Document Height(inches) x Document Width(inches) x Colour Depth

Therefore an A4 document scanned at 200DPI in b/w would be:

200x200x8.27x11.69x1

= 8700867 Bits

Which is 1087608Bytes or 1062Kb or 1.04Mb

Looking at this I estimate that I can get 675 files on a CD-R and 4,018,109 Files on a DVD-R.

Am I calculating the DVD-R storage incorrectly, the difference between and CD-R and a DVD-R seem astronomical?
0
Comment
Question by:anthonytr
  • 3
  • 2
  • 2
7 Comments
 
LVL 5

Accepted Solution

by:
Aaron earned 250 total points
ID: 40474679
Yeah, the difference between CD and DVD is about 6.7 times differnet-DVD has 6.7 times more storage than that of a CD... THat is if the DVD is 4.7 GB and the CD is 700 MB which is usually the standard you most often find in stores. I believe that you're first calculation looks about right as most images are around that size... if you know what kind of image you would like to store simply check a few (maybe 10) random images you plan on and then average their sizes. For the most part I would recomend DVD's as they will take up about 1/7th of the space and storage can really sneak up on you.

Going by your first estimate DVD's would be about 4,500+ images of that 1.04MB size. Hope that helps!
0
 

Author Comment

by:anthonytr
ID: 40474711
Thanks Aaron,

I would be looking at using compression Group 2 or 3 so with a ration of 1/10 and 1/20 respectively I should be able to get a great deal more onto a CD or DVD.

For example, the 1.04Mb file compressed returns the following file sizes:
G2 : 106.21Kb
G3 : 53.11Kb

Thats 6,591 and 13,181 files onto a CD respectively.

My question now is, now that my files are in Kb what is the math/equation now to show this in relation to a DVD-R disc?  Do i need to first need to convert the Kb to Gb and if so, what is the equation?

Thanks again.
0
 
LVL 47

Expert Comment

by:dbrunton
ID: 40474729
You are calculating the DVD-R size wrongly.  The CD calculation is pretty close.  I get 677

Also there are Mb, Gb and also Mib and Gib.

Your calculations are above are using MiB and GiB.  See http://en.wikipedia.org/wiki/Mebibyte

One is a multiple of 1000 and the other is a multiple of 1024.

Now for DVD size see http://en.wikipedia.org/wiki/DVD-R#Recordable_DVD_capacity_comparison and for CDR size see http://en.wikipedia.org/wiki/Compact_Disc#Disc_shapes_and_diameters from which we can see that a standard CD has a size of 650 or 700 MiB (737,280,000 bytes) data capacity.

Let's assume that a CD and CD-R have the same capacity.  Then

737,280,000 /  1087608 is approx 677.

For the DVD-R we'll use 4,707,319,808 (see Wikipedia link)

4,707,319,808 / 1087608 is approx 4328
0
Give your grad a cloud of their own!

With up to 8TB of storage, give your favorite graduate their own personal cloud to centralize all their photos, videos and music in one safe place. They can save, sync and share all their stuff, and automatic photo backup helps free up space on their smartphone and tablet.

 
LVL 47

Assisted Solution

by:dbrunton
dbrunton earned 250 total points
ID: 40474738
>>  Do i need to first need to convert the Kb to Gb and if so, what is the equation?

Divide by 1024 to get to Mib and then 1024 again to get to GiB.

Use KiB, MiB, GiB when playing with 1024.

Use Kb, Mb, GB when playing with 1000.

Yep, I get confused as well.
0
 
LVL 5

Expert Comment

by:Aaron
ID: 40474741
I think the easiest way to look at it is whatever you see on the CD you will have about 6.7 times more space on the DVD. As Dbrunton did the math for you on this and came up with (4328 which was close to the 4500 I got) depending on just how accurate you want to be. However I think 6.7x shows a good comparison and there will always be some variance in file size /indexing etc.
0
 
LVL 5

Expert Comment

by:Aaron
ID: 40474744
By the way anthony Cudos for using astronomical in your question I think that is a sorely underused word ha ha.
0
 

Author Comment

by:anthonytr
ID: 40474754
Aaron,

Haha.  When dealing with numbers which return a value with a lowercase 'e' in answer or have far to many zeros that one cares to read 'astronomical' is the only word I could think of.

Thanks for your help on this matter :)

Anthony
0

Featured Post

What Security Threats Are You Missing?

Enhance your security with threat intelligence from the web. Get trending threat insights on hackers, exploits, and suspicious IP addresses delivered to your inbox with our free Cyber Daily.

Join & Write a Comment

Create your own, high-performance VM backup appliance by installing NAKIVO Backup & Replication directly onto a Synology NAS!
If you get continual lockouts after changing your Active Directory password, there are several possible reasons.  Two of the most common are using other devices to access your email and stored passwords in the credential manager of windows.
Notifications on Experts Exchange help you keep track of your activity and updates in one place. Watch this video to learn how to use them on the site to quickly access the content that matters to you.
Saved searches can save you time by quickly referencing commonly searched terms on any topic. Whether you are looking for questions you can answer or hoping to learn about a specific issue, a saved search can help you get the most out of your time o…

757 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now