Understanding Formatted Capacity versus Unformated Capacity

Have you wondered why Formatted Capacity is lesser than the Unformated Capacity of a Hard Disk. Do take a look at this article Formatted capacity confusion clarified

Storage hardware is using the base 10 system and software is using the base 2 system. So no storage is actually lost, it is just a question of how the information is represented.

Compling ANTLR 2.7.7 on CentOS 6

What is ANTLR?

ANTLR, ANother Tool for Language Recognition, (formerly PCCTS) is a language tool that provides a framework for constructing recognizers, compilers, and translators from grammatical descriptions containing Java, C#, C++, or Python actions. ANTLR provides excellent support for tree construction, tree walking, and translation. There are

Step 1: Download ANTLR 2.7.7

Step 2: Untar ANTLR-2.7.7

# tar -zxvf antlr-2.7.7
# antlr-2.7.7

Step 3: For RHEL and CentOS, edit the source file /root/antlr-2.7.7/lib/cpp/antlr/CharScanner.hpp

# vim /root/antlr-2.7.7/lib/cpp/antlr/CharScanner.hpp

Add the following into the CharScanner.hpp file

Step 4: Compile the antlr-2.7.7

# ./configure --prefix=/usr/local/antlr2.7.7 --disable-examples
# make -j 8
# make install


  1. http://sourceforge.net/p/nco/discussion/9830/thread/08ae0201