Since Technet Gallery is closed, now here.

See Script Center version: Powershell functions to split and join binary files fast.

Now also on Powershell Gallery as part of the SysAdminsFriends module, see here or install with

Install-Module SysAdminsFriends

Project page on github is here.

Two Powershell functions to split and join binary files fast. The functions are using .Net BinaryWriter methods.

If .Net 4 or above is detected, the quick .CopyTo() method is used to join files.

2020-05-03: Split-File can chunk into parts of size > 2GB now

in the following examples I assume all files are in the current directory

Dot source the functions first:

. .\Split-File.ps1

You can then split a file BigFile.dat with

Split-File "BigFile.dat" 10000000

into parts of 10000000 byte size or to parts of the default size of 100 MB with

Split-File "BigFile.dat"

The generated part files are named BigFile01.dat, BigFile02.dat, BigFile03.dat ...

You can join the part files BigFile01.dat, BigFile02.dat, BigFile03.dat ... to the original file e.g. with

dir BigFile??.dat | Join-File Rebuild.dat

Rebuild.dat is the same file as the original BigFile.dat.