现代硬盘中的磁性衰减。 [英] Magnetic decay in modern hard drives.

问题描述

当您备份数据并将它们（在硬盘驱动器上）保留相当长的时间时，可能会出现一些字节可能会被烧掉。

因此，重写一个是个好主意不时地使用稳定数据的磁盘。

所以我正在寻找一种每天重写一定百分比驱动器的软件，以便重写它，例如每200天（每天重写0.5％的驱动器）。

有没有人知道这样的程序？


在媒体上留下的损坏越多但不会被读取一次，这个程序就越有趣。

因此越来越多的数据是稳定的在硬盘驱动器上（或将来在SSD上），确保数据保持原始状态变得非常重要...

解决方案

是您正试图解决一个特殊问题？


驱动器制造商通过标记损坏的扇区来设计驱动器以防止这种降级。您可以使用日志文件系统并经常对计算机进行碎片整理来防止数据丢失。


如果您有特别重要的信息，可能需要切换到RAID系统。

不是真正的解决方案。所有这些都是正确的活跃的。驾驶。我在谈论一个驱动器，例如音乐文件放。一旦驱动器已满，它就会留在系统中播放音乐，但从不重写。经过一段时间（几年后，我知道，但这并没有解决问题）写入的字节，由于磁场强度的损失，被丢失。因为他们不能再被相关地阅读了。然而，这与扇区损坏或物理故障无关。为了防止这种损失，可以每天读取驱动器的一小部分并重写它，从而检查读取和写入的部分是否相同。这样就可以确保克服磁场强度的缓慢降低。


因此，它不是关于硬盘驱动器的故障或损坏，而是关于硬盘驱动器的基本工作原理。

事实上同样适用于CD或DVD（特别是质量较差）的人，他们在10到15年后可能会失去信息完整性，这取决于他们的保存方式。 />

这就是为什么我要找一个能做到这一点的软件：每天重写磁盘的一小部分，这样就可以确保信息不会丢失，因为磁场强度损失。

大于1GB的现代硬盘驱动器不会将信息存储在盒式磁带等经典磁场中。相反，通过称为巨磁阻的现象来对齐量子自旋来存储信息（实际上GMR是去年诺贝尔物理学奖的主题）。相邻自旋域的衰减时间可能至少在现代材料中为数十年，比经典磁化域的衰减长得多（你称之为磁强度损失）。因此，重新焕发活力。现代硬盘驱动器几乎不需要你的数据，这可能就是为什么没有人编写这样一款软件的原因。

现在，光存储介质当然是完全不同的，因为通过制造公差，外部干扰，材料缺陷等来破坏数据。通过软件重新获得数据不会让您远离这些数据。

When you back up data and leave them (on a hard drive) for a considerable amount of time, chances are that some bytes may get coorupted.
Therefore it is a good idea to rewrite a hared disk with stable data on it every now and then.
So I am looking for a software that rewrites a certain percentage of a drive every day, so that it is rewritten e.g. every 200 days (rewriting 0,5% of the drive every day).

Does anyone know of such a program?

The more one leaves on media that will get corrupted but are not read-once, the more interesting this procedure gets.
So as more and more data are "stable" on a hard drive (or in the future on an SSD), it becomes really important to make sure the data is preserved in its original state ...

解决方案

Is there a particular problem that you are trying to solve?

Drive manufacturers design their drives to prevent this degradation by flagging corrupted sectors. You can prevent data loss by using a journaled file system and defragging your machine every so often.

If you have particularly important information you might want to switch to a RAID system.

Not really a solution. All those are correct on an "active" drive. I''m talking about a drive where e.g. music files are put. Once the drive is full, it is left in the system to play music from, but never rewritten. After some time (years, I know, but that doesn''t cure the problem) written bytes, because of loss of magnetic intensity, are "lost" in that they cannot be read correcdtly anymore. This has nothing to do however with sectors being corrupted or physically faulty. To prevent this loss, one can read a small part of the drive every day and rewrite it, thereby checking that the read and written parts are identical. This way one is sure the slow degradation of magnetic intensity is overcome.

So it is not about faulty or corrupted hard drives, it is about the basic workings of hard drives.
In fact the same holds true for CD''s or DVD''s (especially of lesser quality) who loose their information integrity after maybe 10-15 years depending on how they are kept.

That is why I''l looking out for a software that does exactly that: rewrite small portions of a disk on a daily basis so that one is sure the information will not be lost because of magnetic intensity loss.

Modern hard drives bigger than ~1GB don''t store information in classical magnetic domains like cassette tapes. Instead, the information is stored by aligning quantum spins through a phenomenon known as giant magnetoresistance (in fact GMR was the subject of last year''s Nobel prize in physics). The decay time for adjacent spin domains probably in the order of decades at least in modern materials, much longer than the decay of classically magnetized domains (what you refer to as "magnetic intensity loss"). Thus "reinvigorating" your data is hardly necessary with modern hard drives which is probably why nobody has written such a piece of software.

Now, optical storage media is an entirely different matter of course, as is the corruption of data through manufacturing tolerances, external interference, material imperfections etc. Reinvigorating your data through software won''t save you from those.

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