what is data redundancy ?
354509
it's when data is entered more than once.
537203
Yes.\n\na)  Hardcopy is the last defence of detecting data corruption. [Data corruption here can range from typos, to the deletion, or addition of entire passages, which completely alter the meaning of the work.]\n\nIt is trivial to determine if something has been added to, or deleted from hardcopy.  For e-copy, making such a determination is, at best, extremely difficult.  If the e-copy has DRM applied to it, making such a determination is impossible. \n\nI suspect that anybody who used DIALOG during the seventies, or eighties, has first hand experience of data corruption.   Papers that were in the hard copy journals, but were not found by doing any DIALOG search.   Typically, thsi was becuase of spelling errors in the title of the journal article, and in the name of the author.  Trivial, except that such errors make the results that were reported impossible for people who either did not read the original hard copy, or do not remember everything that they read in the hardcopy.\n\n"The Way Back Machine" is a great example of demonstrating how data gets corrupted, by additions, or deletions done by the original author.\n\nb) Libraries serve as a repository of knowledge.   As such, they are designed to store information as hardcopy. This is the only format that will last for more than 50 years.
612406
This is the back-up strategy that a company has for putting a computer system back up in the event of a catastrophic event, such as a power outage or a network failure.  Often this is done at another location (in the even of a power failure for example).  All companies have a disaster recovery (aka DR) plan if they intend to have on-going operations of their computer systems.  Often involves having a duplicate system in another datacenter ready to go in the event of an emergency.
138509
(I'm taking a wild guess).\n\nIf limited to two, I would say\n1) Reorganization\n2) Filtering\n\nGiven a set of data, we normally either sort or otherwise re-organize it to make sense, or we take a subset of it, that which we want to deal with.\n\nI say limited to two, because I would say "of things we do to data, we"...\n1) Create it\n2) Reorganize it\n3) Filter It\n4) Change It\n5) Delete It\n... however, you could argue successfully that if you do 1), 4), or 5), you don't have the "same" data, thus "manipulating" it could be limited to 2) and 3).
162178
A CRC is used to determine if there has been an error\nin the transmission or storage of data.  The theory\nis that the bits of an information stream can be used\nas the coefficients of a polynomial to compute a signature\nof the data.  Pragmatically, the bits or bytes of the\ndata are combined with fast/simple operations (typically\nshift and XOR).  At the end of some short stream, the\nvalue of the CRC is checked to determine if there has\nbeen a tranmission (or storage) error.\n\nIf something is reporting a CRC error, that means that\nyour information has been corrupted.  Typically you\nwouldn't see this message if the mechanism was able\nto automatically correct it (ie. via retransmission\nor via repair using redundant storage).  Since you're\nseeing the message, it may mean that you have actually\nlost some data.\n\nFor a much more in-depth explanation of CRC, see the\nreference.
298570
Hardrive data is stored as small bumps and lack of bumps refered to as binary (yes/no one/zero).  When you erase those bumps by deleting a file, the other bumps don't go away, but they can move when you defrag a hard drive.  It's like putting a hole in a fence when you delete a file and when you defrag it's like moving the remaining fence inward to fill in where the hole is.
87308
CRC error = Cyclic Redundancy Check Error.\n\nIt is a key element of error detection in data and communication systems. CRC bytes are stored along with data packets and this is computed based on the content of the data packet before transmission. The receiver does the same computation on the received packet and compares the CRC bytes. If the CRC bytes are not equal, we have a CRC error.\n\nFor more technical info: http://en.wikipedia.org/wiki/Cyclic_redundancy_check
1122352
Urmmm\n\nData information is information held by people, in most cases it refers to computer based information.
591179
What kind of data?  You mean anything or pictures, words, or ??
1176873
it is impossible \ndata are not recover from formated hard disk \nimpossible, not possible, never ,,\neven dont try , it is impossible.......................(possible if disk is not formated)
702933
There are tons of reasons for hard drive failure. But you should note that the data you don't have at least two copies is the data you don't care about. You can prevent any bad consequences of hdd failure either using backup software for example True Image by Acronis or using RAID 1 array of hard drives.
42727
It depends on the type of data you have
86470
When you first delete a file, it does still exist on your hard drive. However, the space that the file took up on the drive is now free to be reused by other files. This does mean that a new file can overwrite the old file, making it difficult to read or retrieve. However, even when a file has been written over, it is still possible to retrieve the underlying data. I have read that in some cases, experts with advanced tools can retrieve files that have been overwritten five or six times. There are programs out there that make sure data is really deleted by overwriting a file up to a hundred times with random data. This is probably overkill, but I'm sure it's effective. In most cases for normal people, such extreme measures should not be necessary.
5042
only data ob d:&#92; will be lost
792766
It is compared to the data already in their database. If a solution is there, a "more information" box will be displayed that reveals the potential solution.
198331
The area of the drive used to store the files is marked as available, but the data remains there. When something else needs to be saved, it may be saved to that area of the drive (because it is marked as available.) If it is, the previous data is destroyed. Until such time as the data is overwritten, it can be recovered using special programs. In some cases, the data can be recovered even after being overwritten, but the process requires a professional and is rather expensive. ($1000+).
1109253
Relating to what???  There are lots of different data sets.