External Hard Disk- Seagate

Some preferred this product bcos of their aluminium casing.

Seagate product
Overall product (external drive) : http://www.seagate.com/www/en-us/products/external/

Specific product for backup data.
1- Free-Agent
Overview product : http://www.seagate.com/www/en-us/products/external/freeagent/

2-Expension Hard Drive
Sources : http://www.seagate.com/www/en-us/products/external/expansion/

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Related link : external hard disk