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What's the difference between getCacheKeyInfo and _getCacheId?
Why _getCacheId is not enough to cache a block?

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getCacheKeyInfo is used to determine the cache key if one is not set directly for blocks.
It is used in Mage_Core_Block_Abstract::getCacheKey() that is used _loadCache method on the same block _getCacheId is not used at all for block caching and it is deprecated starting CE 1.4.0.0-alpha3.
Honestly I have no idea what was the use if it before 1.4.

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After 1.4.0.0-alpha, magento deprecated _getCacheId() may be in order to improve Mage_Core_Model_Cache.

You see more details about deprecated from 1.5.0 and check this link at http://docs.databyte.at/magento/community/1.5/deprecated.html

Now getCacheKeyInfo() use for cache

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