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Java Forum / General / June 2007Serial number
i want to generate a number that is unique for a machine. I decided to get hdd serial. But i have to find more than that. which hardware numbers can i take? how? > i want to generate a number that is unique for a machine. > I decided to get hdd serial. But i have to find more than that. > which hardware numbers can i take? how? Please do not multi-post (the placement of the same message independently in multiple newsgroups). It fragments the thread and frustrates folks who are trying to help you. If you absolutely feel the overwhelming need to reach multiple groups, which you shouldn't usually, then cross-post (place the same message into multiple groups at once using multiple addresses on the same copy of the message so that all replies are seen by all groups). Usually it's better to pick the one group that fits. Read the groups' FAQs.  SignatureLew > > i want to generate a number that is unique for a machine. > > I decided to get hdd serial. But i have to find more than that. [quoted text clipped - 13 lines] > -- > Lew thanx lew. i know how to use groups. ... (re. multi-posting) >...i know how to use groups. The evidence suggests otherwise. SignatureAndrew Thompson http://www.athompson.info/andrew/ > .. > (re. multi-posting) [quoted text clipped - 7 lines] > > Message posted via JavaKB.comhttp://www.javakb.com/Uwe/Forums.aspx/java-general/200705/1 i know i did a mistake but there is no need to be wordy. This is a group that i can request for help. I have requested. >>> i want to generate a number that is unique for a machine. >>> I decided to get hdd serial. But i have to find more than that. [quoted text clipped - 14 lines] > > thanx lew. i know how to use groups. You're very welcome. Glad I could help. SignatureLew >> i want to generate a number that is unique for a machine. >> I decided to get hdd serial. But i have to find more than that. >> which hardware numbers can i take? how? for Intel CPU, there isa CPU serial number you can get at via JNI. See http://mindprod.com/products1.html#CPUSER -- Roedy Green Canadian Mind Products The Java Glossary http://mindprod.com >>> i want to generate a number that is unique for a machine. >>> I decided to get hdd serial. But i have to find more than that. [quoted text clipped - 7 lines] > The Java Glossary > http://mindprod.com only if it is enabled in the bios. Steve >>>> i want to generate a number that is unique for a machine. >>>> I decided to get hdd serial. But i have to find more than that. [quoted text clipped - 8 lines] > > only if it is enabled in the bios. Thus your "Write Once, Run Anywhere" code becomes non-portable even down to the hardware level, much less the OS level. AFAIK there is no inherent unique identifier for a computer, at least none assigned by an outside authority with a promise of uniqueness. In the case of the Intel CPUID, the public reacted negatively to the proposal and it either died or went underground. Does the chip even still have it? Is it enabled or disabled by default? Looks like you'll have to create your own. SignatureLew >>>>> i want to generate a number that is unique for a machine. >>>>> I decided to get hdd serial. But i have to find more than that. [quoted text clipped - 14 lines] > > Looks like you'll have to create your own. Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | > AFAIK there is no inherent unique identifier for a computer, at least > none assigned by an outside authority with a promise of uniqueness. I think the nearest you can come is the hardware address in an Ethernet card - IIRC that's guaranteed to be unique, rather like the IMEI in a mobile phone. However, cards can be swapped, a computer may have more than one Ethernet interface or it may be using a modem and not have any Ethernet cards installed at all. Last but not least, there seems to be no way to access the card's hardware address within standard classes so you'd need to use non-portable native code to read it. Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | >> AFAIK there is no inherent unique identifier for a computer, at least >> none assigned by an outside authority with a promise of uniqueness. [quoted text clipped - 8 lines] > hardware address within standard classes so you'd need to use > non-portable native code to read it. sorry even the Number in the E card are not unique, there was a cock up several years ago, that resulted in several brands of card having the same sequence of numbers. That said , the number can be changed by a small c program, , hackers use it frequently to hide the nic address/number steve >>> AFAIK there is no inherent unique identifier for a computer, at least >>> none assigned by an outside authority with a promise of uniqueness. [quoted text clipped - 14 lines] > That said , the number can be changed by a small c program, , hackers use > it frequently to hide the nic address/number The duplication had passed me by (and isn't surprising) but I'd always thought the number, once assigned was permanent. I live and learn. Thanks. Signaturemartin@ | Martin Gregorie gregorie. | Essex, UK org | >>>> AFAIK there is no inherent unique identifier for a computer, at least >>>> none assigned by an outside authority with a promise of uniqueness. [quoted text clipped - 17 lines] > The duplication had passed me by (and isn't surprising) but I'd always > thought the number, once assigned was permanent. I live and learn. Thanks. The card is made as part of a formal manufacturing process , where to ensure manufacturing consistency , things have to be manufactured identically, once they pass the "burn in testing", the card "specific " settings are written to the EEprom. , it's the same with a lot of modern hardware. Steve > i want to generate a number that is unique for a machine. > I decided to get hdd serial. But i have to find more than that. > which hardware numbers can i take? how? You're not concerned about your software working across various platforms? If you're sure it's only going to run on one platform (e.g., Windows), there are lots of things you can use. On most platforms you can get an Ethernet MAC address, but you may need to write native methods to do it. However, some platforms may have multiple MAC addresses, and some may have different MAC addresses under different circumstances (when connected wired vs. wireless). > You're not concerned about your software working across various > platforms? Software should work across various platforms >>> I decided to get hdd serial. But i have to find more than that. >>> which hardware numbers can i take? how? I wrote: >> You're not concerned about your software working across various >> platforms? > Software should work across various platforms It's not going to if you do stuff like get the hdd serial. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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