Personal Experiences,Study, Learning Blog of Abu Rashid aka Harun

Types of shredders
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good description at wikipedia
https://en.wikipedia.org/wiki/Paper_shredder

how to manually shred paper without using electric or mechanical shredder machine
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http://lifehacks.stackexchange.com/questions/4117/how-to-shred-papers-letters-without-using-a-shredder-machine

@following the suggestion of the lifehack, I also thing water method is a good one. For more safety you may strike through the important no and name ,address in the document with a pen, then tear manually to several parts,then dip into water[may use 2 litre empty water or soft drink or oil plastic bottle]. When you dip the paper into the water, some ink immediately goes off and others get blurred. Thus you will get a near good security like a pricey shredder. With the water little bit soap may be mixed.


Less costly mechanical option:paper shredding scissors? Basically they are a pair of scissors with multiple (~5) blades and you can use these to quickly shred your paper.

Fire: if possible burn them and make it void for good. However, look into security concerns.

video very nice one:How to destroy documents without a paper shredder. Embassy recommended.
https://www.youtube.com/watch?v=i1CZC0TgvNI

wikihow shows basic scissor method with figures:
http://www.wikihow.com/Safely-Shred-Important-Papers
Shredders can be picked up quite cheaply these days. The best to invest in is a cross shredder which will cut in two directions removing the need to re-shred

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Shredders
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http://www.argos.co.uk/static/Browse/ID72/33016441/c_1/1|category_root|Technology|33006169/c_2/2|33006169|Home+office|33007724/c_3/3|cat_33007724|Shredders|33016441.htm

Argos lowest price around 20GBP so around 2300 BDT

The durable Pro Action desktop shredder is ideal for use at home. Featuring a 4.6 litre waste basket, an economical shredding speed of 2m per minute and the ability to shred 8 sheets at once, this shredder is perfect for anyone who is looking for a practical space saving device.

Product description / spec

The durable Pro Action desktop shredder is ideal for use at home. Featuring a 4.6 litre waste basket, an economical shredding speed of 2m per minute and the ability to shred 8 sheets at once, this shredder is perfect for anyone who is looking for a practical space saving device.

    Throat width 158mm.
    4.6 litre waste basket.
    Accepts .
    Shreds 8 sheets of A5 into 4 x 40mm pieces.
    Shredding speed 2m per minute.
    Auto start/stop.
    Reverse function.
    Easy move handle.
    DIN level 3.
    Size H19.2, W15.6, D24cm.
    EAN: 9031513.
This item is run by main electric, no battery.


Protect your identity by shredding personal and confidential documents. For high security choose a cross-cut shredder. These cut the waste into tiny 'confetti' size bits so it's virtually impossible for a document to be reconstructed. Cross-cut or 'confetti' waste is less bulky so you don't need to empty the basket so often.

Shredder oil may be used in the machine to expand its life.

CD, credit cards
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Genereal shredder is only for paper. So for CD, credit cards and other items, use specialized shredder.

Staples.co.uk has a guide for shredders. It also sells shredder that could take care of staples and credit cards
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http://www.staples.co.uk/cross-cut-shredder-6-sheet-dark-grey/cbs/412815.html?promoCode=300300666&Effort_Code=WW&Find_Number=412815



Shredder Terms
Capacity: The maximum number of 80gsm sheets supported by the shredder in one pass.
Bin Capacity (litres): The volume of waste generated by a cross-cut shredder is up to 80% lower than a strip cut.
Speed: This is based on the approximate number of 80gsm sheets shredded per minute.
Duty Cycle: This is the maximum time of continuous use.
Sound Level: Noise measured in decibels emitted during use.
Maintenance: For proper operation of the cross-cut shredders regularly grease them.


Cross-Cut vs. Strip Cut
The difference between a cross-cut and a strip cut is simple; cross-cut shredders have an enhanced security cut that delivers secure shredding whilst strip-cut shredders are good for basic shredding. In addition, the volume of waste generated by a cross-cut shredder is up to 80% lower than a strip cut.


Understanding Security Levels
The security level of a shredder is measured by the size of the debris of the destroyed document (the smaller they are the higher security level). Take a look at the list below to compare the different security levels.
Choosing a Shredder    
P-1: Shredded data can be reproduced without special equipment, although time-consuming.
P-2: Shredded data can be reproduced with equipment, although time-consuming.
P-3: Shredded data can only be reproduced with considerable effort and special equipment. Use for sensitive, confidential, and personal data.
P-4: Shredded data can only be reproduced using equipment not normally available commercially. Use for particularly sensitive, confidential, and personal data.
P-5: Shredded data is unlikely to be reproduced with state of the art equipment. Use for confidential information.
P-6: Shredded data cannot be reproduced with state of the art equipment. Use for confidential information demanding an exceptionally high level of security.
P-7: Shredded data cannot be reproduced with the current state of science and art. Use for strictly confidential information demanding the highest security precautions.

pic of shredder oil
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http://www.tesco.com/direct/technology-gaming/shredders/cat3376136.cat