A dispersible fibrous structure having an in-use wet tensile strength of at least about 40 gcm; a disposable wet tensile decay of at least about 35% and a method of making the structure. The invention is related to a miniaturized image scanning device and an image scanning method. 50% of total iron expressed as Fe2O3; from 22 to 30% of ferrous-ferric ratio and from 0. A storage controller within a data storage array is configured to store user data in a first page of a first storage device of the plurality of storage devices; generate intra-device protection data corresponding to the user data, and store the intra-device protection data at a first offset within the first page.