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For a reason, when we create a backup of our game disk, there is always a difference between the original disk and the self-burned backup. A lot of games can detect that the disk, inserted in the optical drive isn't an original one.
The game isn't satisfied neither with a virtually mounted image file.
So what makes the difference and how does the software detect it?
Thanks
Maybe this is a superuser.com question, but I'm not sure...
Copy protection schemes involve putting features on the manufactured disk that are difficult or impossible to create using a consumer recorder. One common technique is to put deliberate errors on the disc. See the Wikipedia article on CD/DVD copy protection for more information.
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I have a CD‑R that I have burned some data onto. I know that the consumed storage space cannot be recovered, but is there some way to delete the data so it can't be (easily) recovered from the disk? Not just deleting filesystem entries, but actually burning out the data? My understanding of the way CD‑ROMs works is that the data is physically recorded by etching the bit pattern into a substrate layer in a way that changes the reflective properties of that layer, so one could erase the data by etching the remaining unetched bits. Could this be done, and if so, is there an existing program for accomplishing this?
CD-R is a one time use device. Once the session is closed, there is no way to append or otherwise alter the data image on the disk (to my knowledge).
With a CD-RW, this would be possible my using some type of "format" command.
Unfortunately, the only way to dispose of the data on a CD-R disk is to destroy the media itself.
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It seems there are legal issues associated with AES-256 (it is disabled in Java, and Oracle tells me in their UnlimitedJCE Policy that I am "advised to consult" my "export/import control counsel or attorney to determine the exact requirements" before turning it back on and the page on Wikipedia does not look very friendly either).
It also seems that AES-128 is "fine" (at least the people responsible for putting together the JDK have come to that conclusion).
So can I just use AES-128 and feel happy with my encryption? Is it still safe enough to protect the data for a couple of more years from all but the most resourceful attackers?
Check this very simple website: http://www.keylength.com.
There you can find the various recommendations made by academic and private organizations across the world. They don't all say the same thing, but they are all in the same ballpark.
For instance, NIST claims that AES-128 is fine at the very least up to 2030.
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Is there any difference at all in server load when adding new lines to a big vs. small access.log file?
What I mean is, should I delete my access.log files if they become too big or leave it. It is 6GB right now. I do not rotate.
I'm not sure about the performance difference of big or small files, but maybe you want to split them every month and compress old access-log files. For that you can use logrotate. More information in the man page
Log rotation is an important part of maintaining a server. Without it, you'r likely to fill up your disk, and then your server will behave extremely strangely, depending on the app.
Regardless of performance, you should be using logrotate or something similar.
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Conceptual question, just out of curiosity:
What is less taxing on the graphics processor: Anti-aliasing (2x? 4x? Higher?) on a typical desktop machine (around 120-150dpi) or to drive a hi-density (>300dpi) screen without anti-aliasing? This question could pertain to both desktop systems and embedded (smartphones). I'm interested to see the responses!
Neither usually, since font rendering and AA is done by the CPU (though you can use GPU features to blur). And then it depends on the font rasterizer and how good or bad it was implemented. It also depends on how AA was done, whether a matrix blur was applied, an FFT, or a simple render-bigger-and-bicubic-downsampling was used. Only runtime tests can show.
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How would you go about securely destroying several hundred gigabytes of arbitrary data as quickly as possible?
Incinerating hard drives is a slow, manual (and therefore insecure) process.
Physically destroying the drives does not (necessarily) take a significant amount of time. Consider, for example, http://www.redferret.net/?p=14528 .
I know the answer but this seems like one of those questions best left unanswered unless you know why it's being asked.