#Parent directory rar hard disk serial number changer how to
#Parent directory rar hard disk serial number changer serial number

#Parent directory rar hard disk serial number changer serial number

ShowErrorString( ' Volume serial number changed successfully! ' ' You might want to restart your system for changes to take effect!') ShowErrorString( ' Could not write sector!') write boot sector if (!disk.WriteSector( 0, Sector)) *(PDWORD)(Sector+pbsi.SerialOffs) = newSerial MessageBox(_T( ' Cannot change serial number of this file system!'), try to search for a valid boot sector for (i= 0 i= max_pbsi) ShowErrorString( ' Could not read sector!') read sector if (!disk.ReadSector( 0, Sector)) ShowErrorString( ' Could not open disk!') Sprintf(szDrive, ' %c:\', Drive & 0xFF)

Modify the serial number field according to the current file system (refer to table 1)Ĭopy Code void CVolumeSerialDlg::ChangeSerialNumber(DWORD Drive, const DWORD newSerial)ĭWORD FsOffs // offset of file system name in the boot sectorĭWORD SerialOffs // offset of the serialnumber in the boot sector.

Identify the file system of the drive in question.

Open the hard drive device in order to read/write sectors.

The next part will explain how the ChangeSerialNumber() function can be written. It is important to know that the boot sector starts at sector zero and is 512 bytes long. Usually, the bootsector holds vital data for the integrity and the operation of the file system.Īmong these fields, we list this table with the fields names, file system and the corresponding offset (in hex) of the field in the boot sector:įor example, we can read an entry of this table as: 'In the FAT file system, the 'Serial Number' is stored at offset 0x27 starting from the boot sector origin'.

The most relevant part to look at was the boot sector format of each of the different file systems. Knowing that the serial number is stored in the hard drive, I started looking up information about the three different file systems: FAT, FAT32, NTFS. It is worthwhile noting that the serial number returned by the 'dir' command or the GetVolumeInformation() API is not the hardware serial number that comes from the manufacturer, instead this serial number is assigned and stored in the hard drive (mostly in the boot sector) by the file system and *can* be changed by software. Usually, the serial number of a drive is generated every time you format your hard drive and there is no documented way to change it afterwards.

The article also comes with a handy dialog based application that allows you change the serial number visually. The article's source code files come with a home made DiskSector read/write class for WinNt/2k/XP and Win9x system.

#Parent directory rar hard disk serial number changer how to

This article will demonstrate how to change the drive's serial number on three different file systems: FAT, FAT32 and NTFS. Download source and demo project - 22.1 Kb.