Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 256
  • Last Modified:

What's a "servo embedded" feature

What does it means a Hdd has a "servo embedded" feature ?

0
hhheng
Asked:
hhheng
  • 3
  • 3
  • 2
  • +1
1 Solution
 
jhanceCommented:
First, a "server" track on a disk is a special factory created track on the disk that is used by the controller on the drive to optimally calibrate the position of the HDA (R/W head assembly) over the data tracks on the disk.

It's essentially a "test pattern" that give a particular signal when the head is perfectly in place.

There are two ways of making servo tracks.  The oldest method is to dedicate an entire disk surface to this task.  This means that there is nothing on one entire surface of one of the platters in the disk other than servo tracks.  That means NO DATA.

Embedded servo track are interleaved with data tracks on one or more of the surfaces.  This has the advantage of permitting more data vs. servo information but it does make the manufacturing more complex.  There is also a danger of the R/W head erasing the servo data due to a problem in the drive.  Servo information CANNOT be re-created in the field even with a Low LEvel Format (LLF).  Only special factory equipment can re-do the servo tracks.

As a user of a disk drive, the presence of servo tracks is invisible and the only way you'll know they are there would be by reading marketing or technical documentation on the drive.
0
 
hhhengAuthor Commented:
Thanks again, Mr know-all, ;>))
Cheers..
0
 
jhanceCommented:
Is this an acceptable answer?

If so, you should accept it as an answer.

If not, please explain where additional information is needed.
0
What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

 
ridCommented:
There are people around here, who propose really weak hypotheses (guesswork) as "answers". jhance has given you the opposite here.
Way to go
/RID
0
 
jhanceCommented:
Well, many of the "experts" here learned their stuff from looking at web sites.  There are those of us who have actually been involved in the design and development of real disk drives.  In my case it was the development of microcode in a controller for a Seagate disk drive in the mid-80's.  I think it was a MASSIVE 20MB 5.25" unit.  (It seems like a dinosaur today but back then it was "cutting-edge".
0
 
1175089Commented:
Hey boys, you are so serious /like as Sam (Serious) Stown :-)), proposed answers, rejected answers, these bad gays (like me) with ther guesswork - don't worry, be happy, make love not war- is there anybody?!!!
And now some useful links:
http://www.storage.ibm.com/ipl/oem/tech/noid.htm
http://www.storage.ibm.com/hdd/technolo/truetrack.htm
Aberration, sorry...
0
 
ridCommented:
Serious? Sorry. It must be because it's that day of the week...
/RID
0
 
hhhengAuthor Commented:
..sorry,Wrong click..Monday blues.
0
 
hhhengAuthor Commented:
Thanks "1175089" for info on useful links.

Cheers to everybody.


0

Featured Post

Enhanced Intelligibility Without Cable Clutter

Challenge: The ESA office in Brussels wanted a reliable audio conference system for video conferences. Their requirement - No participant must be left out from the conference and the audio quality must not be compromised.

  • 3
  • 3
  • 2
  • +1
Tackle projects and never again get stuck behind a technical roadblock.
Join Now