Difference between raw device and a block device

Platform : Unix, Unix-like
What is the difference between a raw device and a Block device? I found the following URL by googling. But, posts seem to be mutually contradictory
http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1291798907338+28353475&threadId=583811

a raw device is a special kind of block device file that allows accessing a storage device such as a hard drive directly, bypassing the operating system's caches and buffers (although the hardware caches might still be used). Applications like a Database management system(Oracle ) can use raw devices directly, enabling them to manage how data is cached, rather than deferring this task to the operating system.
block devices correspond to devices through which the system moves data in the form of blocks. These device nodes often represent addressable devices such as hard disks, CD-ROM drives, or memory-regions.
Also Check :
http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1291806443666+28353475&threadId=987277
Regards
Rajesh

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