Abstract: An office machine, for example, a printer, with a printing unit, individual paper transport via driving rollers and endless paper transport via a tractor is to be designed in such a way that as many operating modes as possible can be obtained by simple means. This is achieved at least one releasable cassette for individual paper is in the entry region of a printing unit. A tractor is pivotalby adjustable into a pushing and a pulling position and is located behind the printing unit. The following operating modes are selectable by adjustment of the tractor positions coupled to further components:a. Straight individual paper transport from the front via driving rollers either by manual infeed or by automatic cassette infeed, the tractor being in the pushing position.b. Curved endless paper transport from the rear via the tractor set in the pushing position and via a portion of the driving rollers.c. Straight endless paper transport from the front via the tractor set in the pulling position.

Abstract: Method and apparatus for dividing a track on a magnetizable information storage disc into sectors by writing sector identification information into the track. In order to optimize the storage capacity of a track on a magnetizable information storage disc the track is first filled with information bytes in response to the occurrence of the leading edge of an index pulse (a) derived from the disc in such manner that a predetermined number of bytes fill a portion (ix) of the track, followed alternately by sector identification bytes and further bytes defining the data field of the relevant sector in portions SK and DT respectively until the final group of sector identification bytes has been written into portion SKn, followed by further bytes into portion z until the leading edge of the next index pulse occurs.