[Answered] I has the physical disk of Windows XP Pro Service Pack 1a, my checksums are genuine?

wvv000 · Sep 13, 2025

Sajjo said: ↑
There is a tool (similar to the CRC posted above) - MSCDCRC 4.11 CD-ROM Disc Verification Utility Copyright (C) Microsoft, 1992-2004 upgraded with SHA-1.
So far it's still not shared but there are some references:
Code:
MSCDCRC 4.22 CD-ROM Disc Verification Utility
Copyright (C) Microsoft, 1992-2004

MSCDCRC: Verifying disc in drive D: (1,479,409,664 bytes)

100% complete

MSCDCRC: Computed CRC is 0x8F7459EA
MSCDCRC: SHA1 hash is 0xED7CC8AF67FF4031E450DBA2338089B91F0DEC6A
[REQUEST/INFO] MS Windows Security Update CD - February 2004 [Multilanguage]
Code:
MSCDCRC 4.26 CD-ROM Disc Verification Utility
Copyright (C) Microsoft, 1992-2004
DDP (R) is trademark of DCA Inc. and is Licensed from DCA Inc.

MSCDCRC: Verifying file Microsoft Windows Security Update CD (2004-02)\SECURITY9_CHS_12.iso (489,734,144 bytes)

100% complete

MSCDCRC: AutoCRC is 0xF4AD1F18
MSCDCRC: Computed CRC is 0xFFFFFFFF
MSCDCRC: SHA1 hash is 0x579EC3B0F6D082C1915602FEC943F32A8F399E0C

MSCDCRC: This file contains a VALID computed CRC indicating the contents
         of the file are correct.
This reads the true blocksize of a iso without trailing padding.
You can do this in a hex editor as well, opening a logical drive and calculate checksum but normally you would calculate the hole block, including trailing padding.
That gives a different checksum (usually called padded/overpadded etc)

Size is found at 0x8050-0x8053 and 0x8054-0x8057 (difference is reversed endianess)
Select 0x8054-0x8057 value, remove whitespace (xx xx xx xx -> xxxxxxxx) and convert this hex value to decimal value
We continue using decimal values
This poop's out total sector's value, take this value and multiply with 2048 (sector size value) and you get total (true) bytesize value of iso
You can now select block size offset start 0 to offset end bytesize
(remember - total bytesize starts from 1 but in a hexeditor we start at 0 so you must subtract total bytesize by 1)
Calculate checksum of this block - done.

Since this iso has AutoCRC, you can test that you selected correct blocksize and offsets by calculating CRC-32, this should output CRC-32: FFFFFFFF

(if anyone wondered how )
Click to expand...
The original copy of the program is with me, and it will not appear in the sharing entries due to the signed 'confidentiality agreement'.

bencu55 · Sep 13, 2025

CaptainKirk1966 said: ↑

Feeling guilty after closing too early, so I would ask some questions..

@bencu55 - If you have, using 7zip, created an iso from the physical disk, does the crc of the iso match that of the physical disk posted in #13 above?

Can you now use the built in function of 7Zip to compute md5, sha1, sha256 of that iso? Does that match what you posted in #1 above?

There is also hu_windows_xp_professional_with_service_pack_3_x86_cd_x14-80456.iso on archive.org that doesn't match anything posted here so far. (non-oem most likely)
Click to expand...

MD5: ab144054cf58463261c5e506e991c13d
SHA1: a1254fd653b62175b8b12a4918ae15aebe504b3a
SHA256: fc5dda3a8cbf20a18f56e4a9b582ebbd65017daaf9934cebaa5690e59d9dc8ed
CRC32: FFFFFFFF
yes crc match

CaptainKirk1966 · Sep 13, 2025

Thank you. Your disk is rare enough that these file hashes don't seem to be shared anywhere. But it certainly appears to be genuine, since you have the original MS packaging, the disk has the holographic image, etc.

Sajjo · Sep 13, 2025

You need to login to view this posts content.

[Answered] I has the physical disk of Windows XP Pro Service Pack 1a, my checksums are genuine?

wvv000 MDL Addicted

bencu55 MDL Novice

CaptainKirk1966 One of the Green Guys
Staff Member

Sajjo MDL Member

Attached Files:

dsfo.7z

[Answered] I has the physical disk of Windows XP Pro Service Pack 1a, my checksums are genuine?

wvv000 MDL Addicted

bencu55 MDL Novice

CaptainKirk1966 One of the Green Guys Staff Member

Sajjo MDL Member

Attached Files:

dsfo.7z

CaptainKirk1966 One of the Green Guys
Staff Member