I'm Right, Aren't I ???
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You have been a member for 9 years and you have less than 1,000 valuable rep points to your name? Where have you been hiding? :)
-- ** You don't hire a handyman to build a house, you hire a carpenter. ** Jack of all trades and master of none.
Good catch. Here's my lame excuse. Its either because I don't know anything of value, are too busy to hang out here except when I'm really stumped, or am not confident enough to help with some questions. In reality its a combination of all three. Sorry. I used to help out quite a bit (in other) forums (non programming related) and have been through all of the growing pains from helping novices who ask the same questions over and over till at some point (usually in a couple of years) you either start answering smart - like RTFM or FAQ, or you withdraw slowly. I'm now a slacker, slacker.
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I may be going bonkers so just wanted to check that I'm thinking correctly. We sent a CDROM disc to our sister organization (at another location) which does printing of our documentation and attachments i.e. our program on CDROM disc. They, of course, contract this out. And, of course, the last time we tried to handle this electronically, we just sent an ISO image (as a file ending in the extension .iso). And you know what happened, right? Yep, we got a CDROM proof sent back with the .iso file on it. So, of course we now stick to snail mail. However, I've decided to make the CD and create an ISO image of the CD we are sending. The plan being, that when I receive the proof back from the contractor via our sister org, that I will make an ISO image of that CD too. Then, I'll generate a MD5 and SHA1 hash for both ISO images and compare the two image's hashes. Should be the same, right? Turned out....wrong. So, just to be sure I binary compared the two ISO images and of course there are many, many differences. Am I wrong to think that this should work, that they should compare exactly? Of course, the contractor, which I spoke to directly tells me that they always just select copy disc from whatever equipment and/or software that they use. When asked about whether they could accept an ISO image, they were unsure and would have to get back to me. When asked whether they could receive an ISO image via FTP or website upload, they said no. Of course, what should I expect from a major overnight package delivery service which moonlights now as a reproduction service?
Are you running a checksum program on the ISO images? I'm wondering if you burn an ISO to disk if the burning software adds anything to the disk and then when you pull an ISO off of the new disk it might be slightly different. :doh:
The environment that nurtures creative programmers kills management and marketing types - and vice versa. - Orson Scott Card
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I may be going bonkers so just wanted to check that I'm thinking correctly. We sent a CDROM disc to our sister organization (at another location) which does printing of our documentation and attachments i.e. our program on CDROM disc. They, of course, contract this out. And, of course, the last time we tried to handle this electronically, we just sent an ISO image (as a file ending in the extension .iso). And you know what happened, right? Yep, we got a CDROM proof sent back with the .iso file on it. So, of course we now stick to snail mail. However, I've decided to make the CD and create an ISO image of the CD we are sending. The plan being, that when I receive the proof back from the contractor via our sister org, that I will make an ISO image of that CD too. Then, I'll generate a MD5 and SHA1 hash for both ISO images and compare the two image's hashes. Should be the same, right? Turned out....wrong. So, just to be sure I binary compared the two ISO images and of course there are many, many differences. Am I wrong to think that this should work, that they should compare exactly? Of course, the contractor, which I spoke to directly tells me that they always just select copy disc from whatever equipment and/or software that they use. When asked about whether they could accept an ISO image, they were unsure and would have to get back to me. When asked whether they could receive an ISO image via FTP or website upload, they said no. Of course, what should I expect from a major overnight package delivery service which moonlights now as a reproduction service?
JohnnyG wrote:
a major overnight package delivery service which moonlights now as a reproduction service
That's me. :-\
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Good catch. Here's my lame excuse. Its either because I don't know anything of value, are too busy to hang out here except when I'm really stumped, or am not confident enough to help with some questions. In reality its a combination of all three. Sorry. I used to help out quite a bit (in other) forums (non programming related) and have been through all of the growing pains from helping novices who ask the same questions over and over till at some point (usually in a couple of years) you either start answering smart - like RTFM or FAQ, or you withdraw slowly. I'm now a slacker, slacker.
At least you are honest. Nothing wrong with being a slacker. I usually do about 30 minutes of "real" work then I comment/post something obnoxious or offensive and then I go back to my work. I usually repeat this process until I get bored or it's time to go home.
-- ** You don't hire a handyman to build a house, you hire a carpenter. ** Jack of all trades and master of none.
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JohnnyG wrote:
a major overnight package delivery service which moonlights now as a reproduction service
That's me. :-\
AspDotNetDev wrote:
JohnnyG wrote:
a major overnight package delivery service which moonlights now as a reproduction service
That's me. :-\
Sperm Bank?
The environment that nurtures creative programmers kills management and marketing types - and vice versa. - Orson Scott Card
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AspDotNetDev wrote:
JohnnyG wrote:
a major overnight package delivery service which moonlights now as a reproduction service
That's me. :-\
Sperm Bank?
The environment that nurtures creative programmers kills management and marketing types - and vice versa. - Orson Scott Card
Hey, at least then I have somebody paying ME for those services. :-O
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I may be going bonkers so just wanted to check that I'm thinking correctly. We sent a CDROM disc to our sister organization (at another location) which does printing of our documentation and attachments i.e. our program on CDROM disc. They, of course, contract this out. And, of course, the last time we tried to handle this electronically, we just sent an ISO image (as a file ending in the extension .iso). And you know what happened, right? Yep, we got a CDROM proof sent back with the .iso file on it. So, of course we now stick to snail mail. However, I've decided to make the CD and create an ISO image of the CD we are sending. The plan being, that when I receive the proof back from the contractor via our sister org, that I will make an ISO image of that CD too. Then, I'll generate a MD5 and SHA1 hash for both ISO images and compare the two image's hashes. Should be the same, right? Turned out....wrong. So, just to be sure I binary compared the two ISO images and of course there are many, many differences. Am I wrong to think that this should work, that they should compare exactly? Of course, the contractor, which I spoke to directly tells me that they always just select copy disc from whatever equipment and/or software that they use. When asked about whether they could accept an ISO image, they were unsure and would have to get back to me. When asked whether they could receive an ISO image via FTP or website upload, they said no. Of course, what should I expect from a major overnight package delivery service which moonlights now as a reproduction service?
There is a difference between burning discs and reproducing disks in my limited understanding. Reproducing disks uses a master disk and a big expensive machine. Burning discs is done overseas by the lowest bidder with an obsolete HP and pirated software.
Need custom software developed? I do custom programming based primarily on MS tools with an emphasis on C# development and consulting. I also do Android Programming as I find it a refreshing break from the MS. "And they, since they Were not the one dead, turned to their affairs" -- Robert Frost
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I may be going bonkers so just wanted to check that I'm thinking correctly. We sent a CDROM disc to our sister organization (at another location) which does printing of our documentation and attachments i.e. our program on CDROM disc. They, of course, contract this out. And, of course, the last time we tried to handle this electronically, we just sent an ISO image (as a file ending in the extension .iso). And you know what happened, right? Yep, we got a CDROM proof sent back with the .iso file on it. So, of course we now stick to snail mail. However, I've decided to make the CD and create an ISO image of the CD we are sending. The plan being, that when I receive the proof back from the contractor via our sister org, that I will make an ISO image of that CD too. Then, I'll generate a MD5 and SHA1 hash for both ISO images and compare the two image's hashes. Should be the same, right? Turned out....wrong. So, just to be sure I binary compared the two ISO images and of course there are many, many differences. Am I wrong to think that this should work, that they should compare exactly? Of course, the contractor, which I spoke to directly tells me that they always just select copy disc from whatever equipment and/or software that they use. When asked about whether they could accept an ISO image, they were unsure and would have to get back to me. When asked whether they could receive an ISO image via FTP or website upload, they said no. Of course, what should I expect from a major overnight package delivery service which moonlights now as a reproduction service?
So do an empirical test, repeat your process and see if there are differences on your own 2 images. Then repeat the process with different software. It may be as simple as a timestamp used in the process but I'm betting different software will produce different results.
Never underestimate the power of human stupidity RAH
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Are you running a checksum program on the ISO images? I'm wondering if you burn an ISO to disk if the burning software adds anything to the disk and then when you pull an ISO off of the new disk it might be slightly different. :doh:
The environment that nurtures creative programmers kills management and marketing types - and vice versa. - Orson Scott Card
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So do an empirical test, repeat your process and see if there are differences on your own 2 images. Then repeat the process with different software. It may be as simple as a timestamp used in the process but I'm betting different software will produce different results.
Never underestimate the power of human stupidity RAH
Well, I probably will but I do not have the same reproduction system and software that the contractor has so I'm not sure it will prove much. I still think that there should be no differences because an ISO is an exact copy of the disk AFAIK. Unless there's a part of the ISO file format e.g. header that can store specific information that may vary from burner to burner. I'll look into that next.
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So do an empirical test, repeat your process and see if there are differences on your own 2 images. Then repeat the process with different software. It may be as simple as a timestamp used in the process but I'm betting different software will produce different results.
Never underestimate the power of human stupidity RAH
Okay. I did what you suggested (using the same software and same PC as in creating an image from a disc I burned previously and comparing) and there are differences. All differences appear in the first 50k of the .iso file. Apparently, something besides a timestamp has been updated. Am now just using WinZip to zip up both disc's contents and comparing CRC's for each file. They all check out, exact match.