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No drive platter is manufactured perfectly. There will always be some bad spots on the platter surface. Modern hard drives automatically mark those bad spots as unusable and do not store data there.
Sometimes bad spots will develop during the life of the hard drive. The hard drive will mark that spot bad and attempt to move the data to a good spot on the hard drive. This may, or may not, result in the loss of some data.
Serious hard drive platter failures can occur as a result of hard drive arm failures. In these cases, the hard drive platters are being scratched. Your data is being scratched right off the surface of the platters! You can often hear this damage occuring. These failures are very expensive or impossible to recover.