File split defaults to 4.34 GB

I'm running V10 although the same problem happened in V9 both on WinXP and on two different PCs. I have set the default backup size to 4.7 GB to fit a DVD but each time I backup the default is reset to 4.34 and I have change it. How can I make the larger size stick ?

 

You can't fit 4.7GB on a DVD. DVD's use a different caluclation to get their size. As a result only 4.34GB will fit.

 

Hard-drive, DVD, CD makers use K=1000 instead of 1024 to describe their offerings. By using K=1000 it makes the size look bigger.

If you multiply the 4.34 by 1.024 3 times to adjust for Kilobytes, Megabytes and Gigabytes you get to 4.66 which is rounded to 4.7. The actual space available is the same it is just how it is described.

Computers use binary internally and 1024 is 2 to the 10th power.

 

I think the confsion here is that according to ISO units :

K=1024
k=1000

It's just that those responsible for labelling and packaging things like optical disks don't appreciate the difference that the case of a letter makes.

F

 

If you're putting the backup on dvd, it is recommended to choose a split size of less than 2G - something to do with how the file is burned to the dvd. Many here like to use 1492Mb - means something to those in the USA. Three of those will fit nicely on a dvd with little waste.

 

Yes, although fairness there is confusion right across the board. This link provided some interesting info under Computing about half way through the document:

http://www.poynton.com/notes/units/index.html

 

Staying under 2GB permits the use of the ISO file system rather than UDF. ISO is compatibly with more systems than UDF but UDF is not a problem with TI or Windows. TI does (or did) want UDF written version 2.01 or earlier though. I think this is for the Linux boot disk.

I always use a split of 1492 MB whether or not the file is going to be put onto DVD or not so if I change my mind there is no problem. There is no big advantage to having one big file instead of several smaller ones and I think having smaller is sometimes better. Set it and forget it!

 

That's different from my understanding. I thought K was 2**10 and k was 2**-10 So K is > 1 and k is < 1. Another use is to have the upper case represent bytes and the lower, bits. Which can be confusing as there are not necessarily 8 bits in a byte.

But back to my original post. I will attach a screen shot that leads me to believe that I will get 4.7GB files. Yet next time I go through the process the default will be 4.34. Now the explanation may well be in the difference between decimal and binary representations of G, but surely it should at least be consistent within the same program.

 

Not according to SI standards. It would be interesting to get my weekly 4kg of apples from the supermarket - I wouldn't break sweat carrying 4 grams of apples home

F.

 

I won't argue against consistency but it seems like TI used the commonly used number for displaying the options then converted it to what the program needs and once that happens displays the converted number.

If they had displayed 4.34G the question would be how come there is no 4.7GB option.

 

Hello everyone,

Thank you for choosing Acronis Disk Backup Software.

We are sorry for the delayed response.

Please have a look at this article describing the DVD disc capacity.

Thank you.
--
Aleksandr Isakov

 

Well learn something new every day. Knew there was a reason I was reading these forums.

The wikipedia Link posted by Acronis, led me to..

Binary Prefix

That 4.34GB is not 4.34GB but 4.34GiB or 4.34 gibibyte.

4.34Gib is the same as 4.7GB

I agree that TI should be consistent on its use of terminology.