what is Perpendicular Storage technology

[asher_friends]

hey there....i am really curious to know what is Perpendicular storage technology rather than the conventional one....which is used by Segate newest released hard-drive which has the capacity of 750GB.....I have read abt this before but,twas no clear...what do u say guys..any idea

[william]

The main challenge in designing magnetic information storage media is retaining the magnetization of the medium despite thermal fluctuations. If the thermal energy is too high, there may be enough energy to reverse the magnetization in a region of the medium, destroying the data stored there. The energy required to reverse the magnetization of a magnetic region is proportional to the size of the magnetic region (where a larger magnetic region is more stable), as well as to the magnetic coercivity of the material, there is a minimum size for a magnetic region at a given temperature and coercivity. If it is any smaller it is likely to be randomly de-magnetized. Perpendicular recording uses higher coercivity material. This is possible due to the fact that the head's write field penetrates the medium more efficiently in the perpendicular geometry.

The popular explanation for the advantage of perpendicular recording is that it achieves higher storage densities by aligning the poles of the magnetic elements, which represent bits, perpendicularly to the surface of the disk platter, as shown in the illustration. In this not quite accurate explanation, aligning the bits in this manner takes less platter than what would have been required had they been placed longitudinally. So they can be placed closer together on the platter, thus increasing the number of magnetic elements that can be stored in a given area. The true picture is a bit more complex, having to do with the use of a magnetically "stronger" (higher coercivity) material as the storage medium. This is possible due to the fact that in a perpendicular arrangement the magnetic flux is guided through a magnetically soft (and relatively thick) underlayer underneath the hard magnetic media films (considerably complicating and thickening the total disk structure). This magnetically soft underlayer can be effectively considered a part of the write head, making the write head more efficient, thus making it possible to produce a stronger write field gradient with essentially the same head materials as for longitudinal heads, and therefore allowing for the use of the higher coercivity magnetic storage medium. A higher coercivity medium is inherently thermally more stable, as stability is proportional to the product of bit (or magnetic grain) volume times the uniaxial anisotropy constant Ku, which in turn is higher for a material with a higher magnetic coercivity.

in short perpendicular technology stores data perpendicular to disk than the longitudinal metho, parallel to disk.

[mihirvashist]

Originally Posted by william

The main challenge in designing magnetic information storage media is retaining the magnetization of the medium despite thermal fluctuations. If the thermal energy is too high, there may be enough energy to reverse the magnetization in a region of the medium, destroying the data stored there. The energy required to reverse the magnetization of a magnetic region is proportional to the size of the magnetic region (where a larger magnetic region is more stable), as well as to the magnetic coercivity of the material, there is a minimum size for a magnetic region at a given temperature and coercivity. If it is any smaller it is likely to be randomly de-magnetized. Perpendicular recording uses higher coercivity material. This is possible due to the fact that the head's write field penetrates the medium more efficiently in the perpendicular geometry.

The popular explanation for the advantage of perpendicular recording is that it achieves higher storage densities by aligning the poles of the magnetic elements, which represent bits, perpendicularly to the surface of the disk platter, as shown in the illustration. In this not quite accurate explanation, aligning the bits in this manner takes less platter than what would have been required had they been placed longitudinally. So they can be placed closer together on the platter, thus increasing the number of magnetic elements that can be stored in a given area. The true picture is a bit more complex, having to do with the use of a magnetically "stronger" (higher coercivity) material as the storage medium. This is possible due to the fact that in a perpendicular arrangement the magnetic flux is guided through a magnetically soft (and relatively thick) underlayer underneath the hard magnetic media films (considerably complicating and thickening the total disk structure). This magnetically soft underlayer can be effectively considered a part of the write head, making the write head more efficient, thus making it possible to produce a stronger write field gradient with essentially the same head materials as for longitudinal heads, and therefore allowing for the use of the higher coercivity magnetic storage medium. A higher coercivity medium is inherently thermally more stable, as stability is proportional to the product of bit (or magnetic grain) volume times the uniaxial anisotropy constant Ku, which in turn is higher for a material with a higher magnetic coercivity.

in short perpendicular technology stores data perpendicular to disk than the longitudinal metho, parallel to disk.

this answer is not yours...you have copy pasted it from somewhere else.....
one line "as shown in the illustration" in ur answer proves my point....
you shud have given the source at least ...what's the use of taking credit of something you haven't done .....
-------------------
for ur convenience i have highlited the line in ur answer .

[asher_friends]

this is an extract from wikipedia.com...dont fool me.....i want a clear explanation...Please

[Tech Geek]

check out this site it contains some explanation on perpendicular storage device
http://www.hitachigst.com/hdd/resear.../pr/index.html

[whistler]

Think Like this....A bookshelf with books...
there r two ways to put books in it...(here, bookshelf is hard disk and books are bits and bytes(data)).
1) put youe books horizontally side by side....
or 2) put them vertically(perpendicular) side by side.....
if u understod it then ok otherwise i can try to explain more...

[asher_friends]

go on whistler.....please explain more abt it