Mac os partition not being detected

I was using samsung hdd in my mac that was bootcamp partitioned. later I replaced the hard drive with the other HDD. Now i am using samsung hdd as external drive and wanna format it but the mac OS partition is not being detected how do I format the whole drive??? I can only see the windows partiton which is 150gb rest 350gb was Mac OS partition which i wanna format but not able to do....please help

Ok, you took out drive #1 which had Lion, Lion Recovery Partition and Bootcamped Windows.
You installed drive #2 internally and installed the Lion Recovery Partition and Lion (via what method?)
You booted from drive #2 and hooked up your drive #1 using either a SATA to USB adapter or powered enclosure and only can see the bootcamped partition? not the previous Lion Recovery or Lion OS X partition.
Some enclosures don't work with OS X
However if you want to format the entire external drive, wiping off everything including OS X, Bootcamp and Windows, all your files and programs, you should be able to select the "size" "brand name" + "model number" + "media" of the actual hardware itself on the far left side in Disk Utility.
(In my case I have two OS X partitions)
If your just selecting the name of your OS X boot partition, like Macintosh HD, then your only formatting that partition not the entire drive.
Click the Partition tab, select 1 partition, Option GUID, format OS X Extended Journaled and click apply, the entire drive will then be formatted for Mac use only.
If you want PC/Mac use, then Option Master Boot Record, format exFAT for 4GB+ files, or FAT (MSDOS) for under 4GB sized files, but most compatibility with other devices and Windows XP machines.
My thread here explains how it all works.
https://discussions.apple.com/message/16276201#16276201

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http://www.apple.com/support/ipad/assistant/itunes/
iOS: Device not recognized in iTunes for Mac OS X
http://support.apple.com/kb/TS1591
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http://support.apple.com/kb/TS1538
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How to put iPod touch / iPhone into DFU mode « Karthik's scribblings
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