Why does my MacBook Pro not boot up with the Snow Leopard Disk?

I have erased the entire hard drive on a 2011 macbook pro that had snow leopard on it. I was corrupted. I not insert my Snow Leopard Disk and the machine will not boot. I chose target mode to erase the hard drive from my mac book pro with Mt. Lion on it.
Thank uou for any help,
Ken

Target mode? Is there a second computer involved? Why not insert the Snow Leopard disc in the computer on which you wish to install and hold down the C key to boot from it?
If the disc came with a different computer it will not boot another model. Retail discs also may not boot all model computers, even those that came with the same major version. For example, some MBPs came with 10.6.6 but a retail disc may only be 10.6.3.

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Mar 20 18:29:26 {COMPUTER NAME} identityservicesd[375]: <IMMacNotificationCenterManager: 0x7f87d510c9e0>: notification observer: com.apple.iChat   notification: __CFNotification 0x7f87d5210a90 {name = _NSDoNotDisturbEnabledNotification}
Mar 20 18:29:26 {COMPUTER NAME} identityservicesd[375]: <IMMacNotificationCenterManager: 0x7f87d510c9e0>:    NC Disabled: NO
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Mar 20 18:29:26 {COMPUTER NAME} identityservicesd[375]: <IMMacNotificationCenterManager: 0x7f87d510c9e0>: Updating enabled: NO   (Topics: (null))
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