| One of the heads is for read and write, and the other is for read-only. Each heads can work independently, so perfect security becomes a reality. Nobody can write, change and delete the data on the disk by read-only head of course. |
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If you use two-heads hard disk drive in your web server, nobody can deface your web site. You can get perfect security if you pay for the two-heads which is a little bit more expensive than a traditional hard disk drive. You are released from frequent update of softwares. You don't need high skills and experiences of network job. |