The present invention relates to crystalline forms A and B of Tigecycline hydrochloride and to methods for the preparation of the same. The layers are joined together by solid polymer ion exchange resin present in at least one of each pair of adjacent layers. The marker is disposed adjacent a perimeter edge of the body to facilitate alignment. A controller passes the code blocks between the processing stages at the proper time and in the proper sequence. The driving element drives the chuck claws both in both a first direction determined to clamp the disc and a second direction determined to unclamp the disc. In addition, the present invention relates to methods of manufacturing and using the compounds of formula I as well as pharmaceutical compositions containing such compounds.