29.5-$\hbox{Gb/in}^{2}$ Recording Areal Density on Barium Ferrite Tape

Abstract

The recording performance of a new magnetic tape based on ultra-fine, perpendicularly-oriented BaFe particles was investigated. Specifically, using a low lateral tape motion demonstration platform, a new servo pattern written on the advanced perpendicularly oriented BaFe medium, a new low friction head technology, a novel synchronous servo channel design, and advanced servo control concepts, we were able to demonstrate a record closed-loop track-follow performance with a 23.4 nm standard deviation of position-error signal, roughly one order of magnitude better than in current tape products. In addition, using read back waveforms captured on the same advanced perpendicularly oriented BaFe medium with a 0.2-m-wide data reader, we demonstrated write/read performance at 518 kbpi using advanced noise-predictive maximum likelihood (NPML) detection schemes. Combining these two results, we estimate that the new medium can support an areal recording density of up to 29.5 Gb/in 2 . This result demonstrates the scalability and extendability of tape technology using low-cost particulate media.

A study on high-density recording with particulate tape media for data storage systems

“…[21] ・Started providing samples and presentations of BaFe tape to various tape drive system companies.…”

“…14 TEM image of the cross-section of magnetic layer [21] Synthesiology -English edition Vol.10 No.1 (2017) of a high recording density by combining the BaFe tape and DD-NPML. The DD-NPML contributes to increased recording density by decreasing the error rate, not just correcting the waveform, as it is a state-of-the-art signal process for a tape system.…”

“…Through application of the new DD-NPML signal process, which was developed by IBM in this joint research project, [14] the readback waveform Research paper : A study on high-density recording with particulate tape media for data storage systems (T. Fig. 13 Surface profiling using the optical interferometry surface roughness meter [21] distortion that was detrimentally affecting the BaFe tape performance was corrected and the target error rate was reached. Hence, IBM decided to set BaFe tape as the central focus of next-generation tape technology.…”

“…In 2010, one year before the market entry of the BaFe product, we achieved a successful technical demonstration of an areal recording density of 29.5 Gb/in 2 [21] (equivalent to a 35 TB cartridge volume). For the BaFe tape employed in this technical demonstration, we accomplished the following:…”

“…The volume of data generated and duplicated internationally was 0.9, 1.8, and 4.4 ZB (10 21 bytes) in 2009, [1] 2011, [2] and 2013, [3] respectively. This is an increase of 40 % per year, with this value being expected to reach 44 ZB in 2020.…”