Why the SFV Code is "FFFFFFFF"?

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lcltj
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Why the SFV Code is "FFFFFFFF"?

Post by *lcltj »

I downloaded ttcmd 6 and use its "Create CRC Checksums(SFV Format)" function and found sfv code of some files are "FFFFFFFF", Why?
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Aezay
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Post by *Aezay »

Sfv is the format in which the output file is created in, CRC32 is the name of the algoritm.
I first thought $FFFFFFFF would be the CRC of an empty file, but that $0.
What special was there about these files, what is their size?
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jy Cheng
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Post by *jy Cheng »

ISO files created by M$ CDIMAGE ? :D
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Ivan Moratinos
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Post by *Ivan Moratinos »

ISO files created by M$ CDIMAGE ?
Maybe the files are too large :-?
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lcltj
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files

Post by *lcltj »

The files I tested are some big ISO files(I don't know what tool they created from ) , 200M~700M. But what confuses me is some 700M file have no problem while 200M file have.
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Post by *jy Cheng »

CD1MAGE is for M$ internal using only, so we should not talk about it more :)
As I know, SFV value of all ISO files created by it are 'FFFFFFFF', even if the file size is large than 700M or less than 64k 8)

.\test.zip\test.iso\REGISTER.WRI of TC6

Code: Select all

begin 644 test.zip
M4$L#!!0``@`(`"B3>B______9`@```#P```(````=&5S="YI<V_MG$UL6UD5
MQ\^+TWRU@0':::A&PREJ&7LF=FSGHXDU(^1QG-2BJ2,G;5I*"2_VB_WH\WON
M>\]MPJ+J;``)56Q&11H!@L4((80&%@A6((1FSX+%B!$2VP&$6($0$L.YUW::
MC[8.**4P^?\<G_=Q[SW_<[_M.#$1````````````````````````````````
M````````````````````````````````````````````````````````````
M`````````````(S<;#*9,HB[D)M=+147'IW>\??\CL-C=.5'/6E@@(9:MX9.
M/$A^5IE/TDCK:L1O'?WJT5,?_3AQ3Z=\MZB>-`N%7*FX5)Q;YERQM%@L99<+
MQ8M/6W^4BQ?SVY)6LE='N92?72A>G)4+GIE.3J9'.3J1GHSQ]'0Z/IV<3OYG
M^KG9PD)V/L_IQ/@,1U/IL>3$V,PY7EZ(\0>1=#(YGDJEIZ2]-)S<!76_86#-
M`0#\;]#3WO^)NSQR-$NK5*(B+3PT?=?^?W8L_V_O_Q][D'R\M?^?;%V=O-,Z
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MQ,[0.;FW+#EC3Z6?#N:!_1\`\`'B_<[^#P```(!#@Z'?8V/_!P````[7_B^<
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M````````_^]T/O\WO_6/MSJ?___HS?=_^R]02P$"%``4``(`"``HDWHO____
M_V0(````\```"````````````"``````````=&5S="YI<V]02P4&``````$`
,`0`V````B@@`````
`
end
sum -r/size 25701/2262
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ghisler(Author)
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Post by *ghisler(Author) »

It seems that these ISO files are created so they have FFFFFFFF as CRC value! If I change a single byte, the SFV will change...
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lcltj
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Post by *lcltj »

I got it. So that's a characteristic of these files. It's funny. thx a lot. :)
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