Encrypted Hard Drives?

[SANDESH49]

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Hello guys,
I just read this term over the forum that there are some external portable hdd known as encrypted Hard Drives.
I dont know what they mean by that?
Why do we need to use such hard drives? are they useful to protect our data from others & loack them with any password & like that?
OR no virus can get into such hdd & corrupt my data if I have such hard drive?
Please help.

[Blakeexz]

Hard-drive encryption is a technology that encrypts the data stored on a hard drive using sophisticated mathematical functions. Data on an encrypted hard drive cannot be read by anyone who does not have access to the appropriate key or password. This can help prevent access to data by unauthorized persons and provides a layer of security against hackers and other online threats.

The concept of hard-drive encryption is simple enough. When a file is written to the drive, it is automatically encrypted by specialized software. When a file is read from the drive, the software automatically decrypts it while leaving all other data on the drive encrypted. The encryption and decryption processes are transparent to all common applications such as word processors, databases, spreadsheets or imaging programs. A computer equipped with hard-drive encryption appears, from the user's point of view, to function as any other computer would.

I hope this help you understand what encrypted hard drives are right?

[SANDESH49]

Hey thanks for the help its really good to read this information.
What should i do or look for if i want to buy a hdd like that?
Do you recommend me any hdd for the same that can encrypt my files?

[SANDESH49]

What about maxtor black armour and buffalo mini Pro?
Which one do you think is better?