Freeware site from Dirk Paehl

Download DP Shredder 1.5
Screenshot DP Shredder

Erase file / folder and overwrite disc free space.
Use the following methode:
1.) ZERO    2.) Pseudoram Data    3.)RCMP (DSX)    4.) US DoD 5220.22-M (E)
5.) US DoD 5220.22-M (ECE) and 6.) Gutmann 35x
Shredder file slack (optional)
SHA1 DP Shredder:455c1def83eb0b81af8ef354ea93f21218a8ecf0

Commandline Modus:
/q Quickshredder
/e
z = zero
p = Pseudorandom data
r = RCMP (DSX)
u = US DoD 5220.22-M (E) 3x
t = US DoD 5220.22-M (ECE) 7x
g = Gutmann (35 pass)

/x =Exit

sample:
DP_Shredder c:\test.txt /eu /x
DP_Shredder c:\test.txt /q /et /x