Modern Hard Disk Drive Systems: Fundamentals and Future Trends

Zhang, Tong; Mathew, G.; Micheloni, Rino

doi:10.1007/978-3-642-14752-4_4

Cited by 2 publications

(2 citation statements)

References 62 publications

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“…A HDD contains two major components: 1) hard disk medium (HDM) [5,6]; 2) head [6,7]. In a HDD the information is written in/read from the HDM by the head [8,9]. To meet the rise of data storage demand, HDD technology has moved from inductive, used prior to 1990 [6,10], to magneto-resistive from 1990 [6,10], and giant MR (GMR) or tunneling MR (TMR) heads from 1997 [6,7,10] and 2004 onwards [6,7,10].…”

Section: Introductionmentioning

confidence: 99%

“…HDM technology moved from particulate media [5] in the first generations HDDs in the late 1950s [5] to thin film media [5,11] after their introduction in the 1980s into 5.35inch drives [5,11]. Servo and signal processing technologies have also advanced [8]. Solid state drives (SSDs) [3,4] are the main competing technology, posing a threat to future HDD viability [4].…”

Section: Introductionmentioning

confidence: 99%

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Graphene Overcoats for Ultra-High Storage Density Magnetic Media

Dwivedi,

Ott,

Sasikumar

et al. 2019

Preprint

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Hard disk drives (HDDs) are used as secondary storage in a number of digital electronic devices owing to low cost (<0.1$/GB at 2016 prices) and large data storage capacity (10TB with a 3.5 inch HDD). Due to the exponentially increasing amount of data, there is a need to increase areal storage densities beyond∼1Tb/in 2 . This requires the thickness of carbon overcoats (COCs) to be<2nm. Friction, wear, corrosion, and thermal stability are critical concerns<2nm, where most of the protective properties of current COCs are lost. This limits current technology and restricts COC integration with heat assisted magnetic recording technology (HAMR), since this also requires laser irradiation stability. Here we show that graphene-based overcoats can overcome all these limitations. 2-4 layers of graphene enable two-fold reduction in friction and provide better corrosion and wear than state-of-the-art COCs. A single graphene layer is enough to reduce corrosion∼2.5 times. We also show that graphene can withstand HAMR conditions. Thus, graphene-based overcoats can enable ultrahigh areal density HDDs>10Tb/in 2 .

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