This invention relates generally to a process for value-added processing of fats and oils to yield glycerol and glycerol derivatives. 01 to 20% by weight in terms of a weight ratio based on the pen tip. With the addition of an assist gas, material may be removed from the nanodevice through application of the low-energy focused electron beam. At least one of the following conditions is true: the information layer has a coercivity that is at least substantially constant between the first and second disk radii; the lower magnetic layer has a magnetic anisotropy energy of no more than about 1.