You're comparing serial no get/set to absread. However depending on format (fat16, fat32, ntfs) serial no is not in the same offsett and in ntfs it's 64 bits value.
Cetin

>Hi Cetin
>
>Your suggestion is working very well. But while I was testing I noticed that the serial no. returned by your routine and what absread() returned are different representation of the same thing. First I was planning that if there is already a srno in the stub file then I will cross check it with your routine's return value. As the stub worked on a 260mb HDD I compared it and they were poles apart, is it some byte placement kind of thing?
>
>>>The usual, the Disk Serial no. My main aim for the copy protection is casual copy protection. Serious hackers will break any if they want to.
>>>
>>>
>>
>>You don't need a C routine to check disk format serial number. If C routine is correct it still works under w2K, XP. In FPD2.x you can load and call binary routines.
>>
>>

>>*SerialBinTest.prg
>>parameters driveletter
>>set talk off
>>clear
>>mp = chr(asc(upper(driveletter))-ASC("A")+1)+chr(0)+;
>>	space(22) && 24 bytes total
>>load serial
>>call serial with mp   && execute binary code
>>? substr(mp,2+1) && First two bytes are always chr(0)
>>cSerial1 = substr(mp,1+2,1)
>>cSerial2 = substr(mp,2+2,1)
>>cSerial3 = substr(mp,3+2,1)
>>cSerial4 = substr(mp,4+2,1)
>>
>>? asc(cSerial4)  && Disk serial number
>>? asc(cSerial3)  && is a doubleword
>>? asc(cSerial2)  && So read in reverse order
>>? asc(cSerial1)  && as shown in dir
>>* Now print in hex format just like dir
>>? "Disk serial number is "
>>?? padl(dec2hex(asc(cSerial4)),2,"0")
>>?? padl(dec2hex(asc(cSerial3)),2,"0")
>>?? ":"
>>?? padl(dec2hex(asc(cSerial2)),2,"0")
>>?? padl(dec2hex(asc(cSerial1)),2,"0")
>>?
>>
>>function Dec2Hex
>>parameters nDecimal
>>n=0
>>do while floor(nDecimal/16^n) > 15
>> n = n+1
>>enddo
>>cHEX = ""
>>for ix=n to 0 step -1
>> cHEX = cHex + DecDigit2HexDigit(floor(nDecimal/16^ix))
>> nDecimal = nDecimal % 16
>>endfor
>>return cHex
>>
>>function DecDigit2HexDigit
>>parameters nDecimal
>>return iif(ndecimal>9,chr(asc("A")+nDecimal%10),str(nDecimal,1))
>>

>>
>>

*Create bin - run once
>>handle=fcreate('Serial.Bin')
>>=FWRITE(handle,CHR(83)+CHR(184)+;
>>  CHR(0)+CHR(105)+CHR(139)+CHR(211)+;
>>  CHR(139)+CHR(31)+CHR(205)+CHR(33)+;
>>  CHR(91)+CHR(203))
>>=fclose(handle)
>>

Cetin