Snow leopard recovery is carried out when you mistakenly happen to delete some data. Supposing you have Mac operating system and you have upgraded to snow leopard version. Later you find that the data present on it has become inaccessible. Actually improper installation of the updated while upgrading can be a big issue which can be faced leading to Mac Snow Leopard Recovery. There can be other factors for the same such as accidentally deleting files, improper partition, boot failure or other logical issues. The root cause of it is that there is probability of catastrophic drive failure that compels you to change the drive. Then you may need to install snow leopard before you can download. You can also create Snow Leopard recovery by partitioning the Mac to invoke old games or Apps. Which is clashing with newer versions of OS X. However, you need to run Mac data Recovery Software for Snow Leopard recovery of previously stored data.