473,854 Members | 1,731 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Magnetic decay in modern hard drives.

4 New Member
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 ...
Nov 5 '08 #1
16 10680
RedSon
5,000 Recognized Expert Expert
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.
Nov 5 '08 #2
wanneslier
4 New Member
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.
Nov 6 '08 #3
arnaudk
424 Contributor
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 magnetoresistan ce (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.
Nov 6 '08 #4
RedSon
5,000 Recognized Expert Expert
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 magnetoresistan ce (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.
Hi,

Can you please site some of your sources. It's not that I don't believe you it is that I would like to read more about it.

Thanks.
Nov 6 '08 #5
arnaudk
424 Contributor
Hi,

Can you please site some of your sources. It's not that I don't believe you it is that I would like to read more about it.

Thanks.
I didn't use a specific source, spintronics is close to one topic I have researched (the 3D Heisenberg model in the context of ultracold atoms) but I think wikipedia has a lot of information on it. My knowledge of the GMR comes comes mainly from the following notes: http://www.phys.uu.nl/~duine/Rembert...pintronics.pdf Let me know it there's anything specific which you'd like to know more about and I'll do my best to find some open access references on the topic.
Nov 6 '08 #6
wanneslier
4 New Member
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..
Thanks a lot for the information. Still ... "probably in the order of decades" ... how probable is this and how many decades. The reason I'm so persistent is simple: since I began using PC's (start of the 80's) I've lost so many material, learning the hard way to better use backups, that I want to minimize my risk. So I already use mirrored drives (fully mirrored) to avoid as much as possible any loss of data due to HD crashes. In your answer the wqrd "probablty" is what makes me shiver. It's the same word that was used with backups to CD's quite some years ago - and which got me into trouble on specific data.

So can you elaborate on "probably in the order of decades"? And 10 years are gone quite fast - which brings us again to the "reinvigorating " of my data ...

I very much appreciate the feedback on this forum. Thanks guys !!
Nov 7 '08 #8
RedSon
5,000 Recognized Expert Expert
If you are looking for serious time spans then you should get these Verbatim UltraLife Gold Archival Grade DVD-R

I heard they are supposed to be good for 100 years.
Nov 7 '08 #9
Curtis Rutland
3,256 Recognized Expert Specialist
I honestly don't see the point of this. Your HDD is far more likely to fail for other reasons long before this ever comes into effect.

But that's the reality of computers...HDD s fail. They're not the best archive solution out there, but for the average consumer, the combination of an HDD and burning DVDs is more than enough. If you are really that worried about your data, buy a tape drive, and lock the tape in a safe.

Also, you have to consider that you will be buying newer HDDs/SSDs before too long. To put it another way, your disks may outlive their usefulness to you. Because eventually, a new disk will be cheap enough with enough storage space and benefits that you will buy it and move your data to the new one. Plus, interfaces change. IDE HDDs are already going the way of the dodo. Eventually SATA will too. So, there are many, many other things to consider before you worry about static data being lost from an HDD.

Perhaps the reason that you aren't finding the software you want readily available because there is no need for it. If there was, you would be sure someone would be selling it.
Nov 7 '08 #10

Sign in to post your reply or Sign up for a free account.

Similar topics

0
1531
by: Captain | last post by:
Wanted older dead hard drives, any size. my son is looking for the magnets from these drives for a school wind generator project, if anyone has any dead drives laying around and willing to donate them, please let me know. thank's. remove NOSPAM to reply
3
2486
by: Ned Hart | last post by:
I'm formatting my mirrored drives and installing a third drive for raid 5 to add more space. I have backup exec. Can anyone tell me the best way to backup SQL so I can be sure it will restore properly? I was thinking of using imaging software and creating an image to a USB 2.0 hard drive. The DB is 80 gigs. Thanks NH
36
4010
by: Ron Johnson | last post by:
http://hardware.devchannel.org/hardwarechannel/03/10/20/1953249.shtml?tid=20&tid=38&tid=49 -- ----------------------------------------------------------------- Ron Johnson, Jr. ron.l.johnson@cox.net Jefferson, LA USA I can't make you have an abortion, but you can *make* me pay child support for 18 years? However, if I want the child (and all the expenses that entails) for the *rest*of*my*life*, and you
2
723
by: Lumpierbritches | last post by:
Thank you in advance for any and all assistance. It is greatly appreciated. Has anyone used Access to keep track with reader/writer magnetic encoders? I have purchased a Fargo Printer that does ink dye sublimation and I'm going to make up gift cards for my clients for gifts. I am also purchasing a serial magnetic reader/writer. I know the readers are basic I/O devices that just capture anything encoded on the cards. I want to know how...
5
5653
by: pandapower | last post by:
Hi, I know about the equivalence of pointer and arrays.But my doubt comes when its for multidimentional arrays.I have read the C faq but still have some doubts. Suppose I have a declaration as 1. char array or char array and it will get decayed to 2. char *array
3
11690
by: Flix | last post by:
I need to detect the root directories of the installed hard disks (es: C:, D:, E:, etc.). I'm not interested in cd drives. I know that there is a way (a bit slow, if I remeber) to retrive all the drives using a code like this: ManagementClass diskClass = new ManagementClass("Win32_LogicalDisk"); ManagementObjectCollection disks = diskClass.GetInstances(); foreach (ManagementObject disk in disks) {
13
4889
by: ragtag99 | last post by:
I posted this on comp.lang.asm.x86, alt.os.development, comp.arch, comp.lang.c++ Im working with windows xp professional, NTFS and programming with MASM, c++ (free compiler) or visual basic 6.0 === question 1 Primarily Im trying to design a program that has full control over a hard disk. What it needs to do is find out what sectors haven't been
3
5272
applets
by: applets | last post by:
Is there an activeX component in connecting a magnetic card reader in vb6.0 application? im currently working on a project that includes scanning magnetic card into the vb application is there a way to connect them or codes to do it? your suggestions would be greatly appreciated thanks..
0
1287
by: Tim Golden | last post by:
Ohad Frand wrote: You can do this with WMI under Windows: <code> import wmi c = wmi.WMI () for i in c.Win32_LogicalDisk (): print i.Caption
0
9901
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
9752
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
0
10371
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
1
7918
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
7082
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
0
5750
by: TSSRALBI | last post by:
Hello I'm a network technician in training and I need your help. I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs. The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols. I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
0
5942
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4563
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
3
3188
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.