Recording over 15 ktpi using multichannel heads in a tape system

Abstract

In magnetic recording systems, it has been reported that sufficient signal-to-noise ratio (SNR) was obtained with a narrow track width, using a spin-valve head and metal-evaporated tape. In order to apply this to a helical-scan tape system, techniques for writing narrow tracks and reading them exactly were required. However, the degree of mechanical accuracy demanded was too high to realize. With this in mind, we have developed multichannel heads which can write and read certain tracks with a single scan, as well as a nontracking technique removing the need for such precise mechanical accuracy. A prototype tape drive employing these techniques was developed, and a track density exceeding 15 ktpi was achieved.Index Terms-GMR head, helical scan tape system, multichannel head, nontracking, spin-valve head.

Tribochemistry of Ionic Liquid Lubricant on Magnetic Media

“…In the most recently established system, the recording density has increased about ten times in this decade using the highly sensitive magnetoresistive head systems [14][15][16]. From the viewpoint of recording density, a smoother media surface exhibits a higher carrier to noise ratio, which makes the higher recording density possible.…”

Metal Evaporated Media

“…The corresponding track margin was 0.25 mm, which allowed recording a barium-ferrite tape medium at 57 ktpi with 0.2-mm-wide GMR readers (Cherubini et al, 2011). Alternatively, multichannel recording and nontracking read systems have been proposed to alleviate the mechanical accuracy requirements for tracking on flexible media (Fukuda et al, 2006;Tamakawa et al, 2006). Using a 4-channels write head and a 8-channels GMR read head, recording over 15 ktpi has been demonstrated in a prototype helical-scan drive with a Co-CoO metal evaporated medium (Fukuda et al, 2006;Tamakawa et al, 2006).…”

“…Alternatively, multichannel recording and nontracking read systems have been proposed to alleviate the mechanical accuracy requirements for tracking on flexible media (Fukuda et al, 2006;Tamakawa et al, 2006). Using a 4-channels write head and a 8-channels GMR read head, recording over 15 ktpi has been demonstrated in a prototype helical-scan drive with a Co-CoO metal evaporated medium (Fukuda et al, 2006;Tamakawa et al, 2006). Figure 2.18 shows an Magnetic Force Microscopy (MFM) image of the adjacent tracks written at 15 ktpi on the metal evaporated medium.…”

“…Channels 1 and 3 were written at a wavelength of 0.48 mm and channels 2 and 4 were written at a wavelength of 1.2 mm (Fukuda et al, 2006). the linear density is reduced by 14%.…”

Protic Ionic Liquids with Ammonium Salts as Lubricants for Magnetic Thin Film Media

“…In the most recently established system, the recording density has increased about 10 times in this decade using the highly sensitive magneto-resistive head systems [1][2][3]. From the viewpoint of recording density, the smoother media surface exhibits a higher carrier to noise ratio, which makes the higher recording density possible.…”