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1
vote
2answers
76 views

Why don't hard drives actually delete data?

As far as I understand it, when you delete a file from trash/recycle bin the file isn't actually erased from memory but is instead marked as being okay to be over written. So, my question is as to ...
4
votes
4answers
280 views

A “triangular” data structure for commutative relationships

A multiplication table is symmetric over a diagonal, so only about $n^2/2$ of the elements in an $n \times n$ multiplication table contain unique information. Same goes for addition tables. In fact, ...
0
votes
1answer
79 views

How to store factorials? [closed]

Can someone help me to store the factorial of large numbers such as 100! efficiently? UPDATE: obviously, storing the argument rather than the factorial digits themselves achieves a significant ...
4
votes
0answers
45 views

Extending the causal memory model to wide-area distributed storage systems

In the seminal paper "Causal memory: definitions, implementations, and programming", distributed causal memory is defined to ensures that all the processes in a system agree on the relative ordering ...
1
vote
1answer
27 views

Why is data stored on a flash disk irretrievable if the memory chip is cracked? [closed]

All data recovery companies, regardless of skill, unanimously say that if the memory chip of a device has just a hair line crack, data recovery is impossible. Not unlikely, not expensive, but ...
1
vote
2answers
2k views

What is the difference between storage media and storage devices [closed]

I am having confusion whether storage media and storage devices are the same terms. I found on this yahoo answers page that ...
2
votes
3answers
116 views

Does the performance of matrix multiplication depend on the storage of the array?

Two matrices can be stored in either row major or column major order in contiguous memory. Does the time complexity of computing their multiplication vary depending on the storage scheme? That is, I ...
3
votes
1answer
231 views

Why do some filesystems have fragmentation and others don't?

I try to understand why fragmentation is a problem for NTFS and FAT but not when using inodes. In all cases, files are not necessarily stored in a contiguous fashion so I don't see the problem for the ...
2
votes
1answer
760 views

SSTF disk scheduling algorithm? What if lowest seek times are equal in either direction?

Using the Shortest-Seek-Time-First (SSTF) disk scheduling algorithm (where we select a request with a minimum seek time from the current head position), what happens if the requests in both directions ...
2
votes
1answer
243 views

Processes and Segmentation

The following problem was on my final and in Gate 2006, but I don't understand how to solve it: Different methods of memory management have different overheads: ...
0
votes
1answer
41 views

calculating storage based upon on eps? [closed]

If an organization collects an average of 20,000 EPS over eight hours of an ongoing incident, that will require sorting and analysis of 576,000,000 data records. Using a 300 byte average size, that ...
2
votes
1answer
196 views

Calculate storage requirements for a data set

I have a simple problem. I can't seem to even find the right search terms to get me pointed in the direction I need to be heading. I'm writing a bunch of integers to disk. Lot's of them. Starting ...
5
votes
4answers
3k views

Is the 2nd parity bit in RAID 6 a simple calculation?

I'm trying to understand how the 2nd parity bit or byte is set in RAID 6. I'm reading a paper by H. Peter Anvin, and it goes into Galois field algebra, which is somewhat new to me. Anyway, a rep from ...
7
votes
0answers
53 views

Distributed Storage for Access and Preservation

My organization wants to maintain multiple copies of data in order to preserve access in the case of localized disasters as well as for the purpose of long term preservation. Are there accepted formal ...