Generalized Concatenated (GC), also known as Integrated Interleaved (II) Codes, are studied from an erasure correction point of view making them useful for Redundant Arrays of Independent Disks (RAID) types of architectures combining global and local properties. The fundamental erasure-correcting properties of the codes are proven and efficient encoding and decoding algorithms are provided. Although less powerful than the recently developed PMDS codes, this implementation has the advantage of allowing generalization to any range of parameters while the size of the field is much smaller than the one required for PMDS codes.