Feeds

Seagate straddles two horses in next gen disk race

HAMR and BPM

  • alert
  • submit to reddit

3 Big data security analytics techniques

Seagate has patented a technology that combines heat-assisted magnetic recording and patterned media.

Patent WO/2004/107323 refers to Patterned Media for Heat-Assisted Magnetic Recording (HAMR).

The back story here is that the hard disk drive industry has to transition to a new recording technology because, as the magnetic grain collections used to signal digital ones or zeroes in the current perpendicular magnetic recoding method get smaller they also get more and more susceptible to random magnetic charge flipping due to temperature change and the influence of surrounding grains.

Two methods are coming to the fore to fix this. One is to pattern the media into distinct recording points - bits - surrounded by insulating material, known as bit-patterned media (BPM), and the other is to make the recording medium less susceptible to minor temperature-induced fluctuation and use heat layered onto the bits from a modified read/write head to enable their magnetic charge to be set when writing data.

Both methods require lots of expensive equipment development, testing, and installation in production processes and it has appeared that part of the industry favours bit-patterning, such as Hitachi GST and Western Digital, with Seagate on the other hand experimenting with developing HAMR.

Now here comes information about a Seagate patent combining both approaches. It was filed at the end of 2004 and the patent abstract reads: "A patterned magnetic recording medium for use in heat assisted magnetic recording comprises an electrically conductive heat sink layer and a plurality of discrete magnetic recording elements positioned adjacent to a first surface of the heat sink layer. Disc drives that include the patterned medium and a method of magnetic recording using the patterned media are also included."

The diagram below indicates the basic idea.

Seagate BPM and HAMR patent

Each patterned bit on the recording medium projects above a heat sink base layer surface. The insulating element around each bit is provided by air.

The patterned media provides extremely small spots to be heated when writing data to the drive. The relatively isolated bits are more susceptible to the quick heating needed.

This patent is instructive in showing that Seagate's R&D encompasses bit-patterned media as well as heat-assisted recording, and did so at least as far back as 2004. It potentially augurs well for the HDD industry to collectively find a common way forward for recording medium technology in the Storage Technology Alliance.

Read the patent document here (pdf). ®

SANS - Survey on application security programs

More from The Register

next story
This time it's 'Personal': new Office 365 sub covers just two devices
Redmond also brings Office into Google's back yard
Kingston DataTraveler MicroDuo: Turn your phone into a 72GB beast
USB-usiness in the front, micro-USB party in the back
Dropbox defends fantastically badly timed Condoleezza Rice appointment
'Nothing is going to change with Dr. Rice's appointment,' file sharer promises
Inside the Hekaton: SQL Server 2014's database engine deconstructed
Nadella's database sqares the circle of cheap memory vs speed
BOFH: Oh DO tell us what you think. *CLICK*
$%%&amp Oh dear, we've been cut *CLICK* Well hello *CLICK* You're breaking up...
Just what could be inside Dropbox's new 'Home For Life'?
Biz apps, messaging, photos, email, more storage – sorry, did you think there would be cake?
IT bods: How long does it take YOU to train up on new tech?
I'll leave my arrays to do the hard work, if you don't mind
Amazon reveals its Google-killing 'R3' server instances
A mega-memory instance that never forgets
prev story

Whitepapers

Designing a defence for mobile apps
In this whitepaper learn the various considerations for defending mobile applications; from the mobile application architecture itself to the myriad testing technologies needed to properly assess mobile applications risk.
3 Big data security analytics techniques
Applying these Big Data security analytics techniques can help you make your business safer by detecting attacks early, before significant damage is done.
Five 3D headsets to be won!
We were so impressed by the Durovis Dive headset we’ve asked the company to give some away to Reg readers.
The benefits of software based PBX
Why you should break free from your proprietary PBX and how to leverage your existing server hardware.
Securing web applications made simple and scalable
In this whitepaper learn how automated security testing can provide a simple and scalable way to protect your web applications.