DVDShrink faster from DVD than ripped?

[EWR-COflyer]

I ran a search and didn't see this mentioned before, so my apologies in advance if someone finds it!

As we speak I have (2) DVDShrink programs running on the same computer performing backups, both of them are 3.0 Beta and both were started at the same time. I have a DVD writer and another DVD drive that is just capable of reading.

On the writer I am a burning a DVD. I have one DVDShrink backing up up from a ripped DVD and another copy backing up direct from DVD.

The backup from DVD is running faster than the ripped version. I find this peculiar, I swore the opposite would be true. The HD is 7200RPM and is running off of its own UltraATA card; I forget the seek speed, etc. I am in the analysis phase and one is at 46% (55 mins remaining) and the other is at 36% (88 mins remaining). I've gone into XP Task Manager and given them both "Low" priority so it doesn't cripple my computer as I work.

And yes, the DVDs in question are the same size and structure. 24: First Season.

Any thoughts?


PS I saw some questions about this yesterday... Last night I had (3) copies of DVDShrink running simultaneously. Two from HD and one direct from DVD. As best I can tell it took about 2.5hrs for all three to complete w/ deep analysis (1.7Ghz, 1GB RAM).

[Kedirekin]

This is entirely possible, even likely.

When you read from the DVD-drive, the hard drive is dedicated to writing, which means it doesn't have to waste time repositioning the read/write heads.

It's just more efficient to read from one device and write to another, especially with a program that's relatively IO bound like DVDShrink is.

[MackemX]

how can you run them both at the same time and make sure its sharing the PC resources equally?

as Kedirekin mentions you are reading from the DVD and writing to the HD with the first version but you are also reading and writing from the HD with the 2nd copy. So that means you are slowing down the access read for the HD source due to it writng in 2 places also

try playing the DVD while you are ripping it and watch how it will suffer and stutter during playback and also slow down the process in DVDShrink

if you want to do a fair test you would do both at different times and I can tell you now its faster from the HD if it's already ripped than processing direct from the DVD. If you add the ripping time then it's slightly slower than doing it direct from DVD

I'd take the slower option to save DVDROM (even though it probably does no harm), but also because you can mod the files before using Shrink :D

[maa]

Also its not fair to expect the HD to read and write at the same time and blame the speed loss on DVDShrink - use a seperate HD to write to and you'll see the difference.

[MackemX]

fair point ;) but most wont have more than one HD but even using the same HD it will probably still process faster than processing direct from the DVD (minus the ripping of course. Another major factor will be the speed your HD can work at while reading and writing at the same time due to your system hardware setup and settings

As you say, reading and writing to different HD's would make it even faster and I always make sure I read and write from one HD to another as it speeds up the processing time no matter what program you are using :D

[EWR-COflyer]

Thanks for the replys...

To be clear, I was not "blaming" anything on DVDShrink, just asking a question more or less.

So, would processing time be much quicker reading from one HD and writing to another, I have (3) HDs.

PS just another quick note. I had (5) DVDShrink processes running simultaneously last night; deep analysis from DVDs ripped to HD (1.7Ghz P4, 1GB RAM). All reading/writing to the same HD. They started at about 11:30pm and finished up about 5:30am.

[MackemX]

Originally posted by EWR-COflyer
Thanks for the replys...

To be clear, I was not "blaming" anything on DVDShrink, just asking a question more or less.

So, would processing time be much quicker reading from one HD and writing to another, I have (3) HDs.

PS just another quick note. I had (5) DVDShrink processes running simultaneously last night; deep analysis from DVDs ripped to HD (1.7Ghz P4, 1GB RAM). All reading/writing to the same HD. They started at about 11:30pm and finished up about 5:30am.

it's still a good point and question to raise :)
the actual processing would be quicker using the HD but the overall process from ripping to getting the complete files wouldn't be

6 hours to do 5 projects which is an average of 1 hour 12 minutes, yet DVDShrink can do one project at a time a lot faster than that

my only question is why on earth are you putting your system through something like that?. Do you need to run more than one process at a time?

[EWR-COflyer]

Originally posted by MackemX
my only question is why on earth are you putting your system through something like that?. Do you need to run more than one process at a time?

Well, they run while I'm sleeping... seems efficient to me!

Sure DVDShrink can do things faster one at a time, no doubt. But, that would mean that I would have to be in front of the computer. And, it would slow my computer down while I actually want to use it. I just load up the HD w/ some DVDs, click a few buttons and in the morning they're all done. It may somewhat cripple my computer at the time, but since I don't need to use it then it really doesn't matter to me at all. I go into the XP Task Manager and assign "LOW" priority to all of the DVDShrink processes so if something else needs to run, it would get top priority and the DVDShrink stuff would just slow down temporarily.

I don't think that I'm doing any harm, its not like the processor is going to get worn out or anything like that.

[maa]

its not like the processor is going to get worn out or anything like that. [/B]

Oooo I don't know ....

Hope you have a good clean fan running on your CPU :D

Normally its faster to run down one cable and up the next (Hd to HD) and saves work and ware on the heads of your HD if it can read and write at one place at one time.

Now having several HDs and a lots of Shrink its going to be quite a calculation to get all that running properly -
I'm sure MackemX knows the way :D :D

[MackemX]

Originally posted by maa
Normally its faster to run down one cable and up the next (Hd to HD) and saves work and ware on the heads of your HD if it can read and write at one place at one time. exactly, you will stress your heads reading and writing 5 processes if you do it all the time

but why do 5 in one night?, why not one a day?. Can I ask how many backups do you do in a week?

[EWR-COflyer]

I don't do all that many... seriously. I had some that I had backed up via an older method, one that preserved only the movie and not the extras, etc. Or, in a format that was not native to the DVD, i.e. episodic DVDs. Now that I discovered DVDShrink, I prefer it for episodic DVDs... so I am redo-ing some of them.

Ripping the DVDs was time sensitive, I had to get 'em all done quickly. But as to why I chose to run all 5 shrink programs at the same time... well, I couldn't answer the question "why not." You're asking "why" and I don't know... I couldn't think of a reason why I shouldn't, so I did. I know, it sounds like backwards logic, and it probably is but that's the truth!

[MackemX]

thanks for the reply and I know what you mean ;)

I just wouldn't recommend you do it all the time, just in case your HD craps out one day. It probably won't but you are just increasing the risk that if it's ever gonna crap out one day, it will do it quicker :)