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hard disk

How do I remove all partitions, data and create clean empty hard disk under Linux operating systems?
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My current /usr file system was full, so I ended up adding a new disk to my FreeBSD server. I've created a new partition at /dev/ad6s1 (size is 250G). How do I move my /usr file system over to my huge new disk at /dev/ad6s1?
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Can you completely explain the nine permissions bits on UNIX or Linux files?
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Debian / Ubuntu Linux: Clear the Package Cache

Q. I've Debian Linux installed on 10 GB hard disk and noticed that /var/cache/apt/archives/ has lots of file taking my precious 1Gb disk space. Can I remove those file safely without causing any side effect on my setup?
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Q. How do I configure CentOS Linux SELinux security to permit httpd 2.2 (Apache web server) to serve the contents of a loopback mounted ISO images located at /var/www/html/lan/iso directory?
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FreeBSD: How To Add A Second Hard Disk

Q. How do I add a second hard disk to my FreeBSD server? How do I partition, label and mount a new hard disk under FreeBSD for backup or additional data?
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Q. How do I find out my SCSI hard disk RPM speed from a Linux shell prompt without opening my server case? How do I find out hard disk model and serial number from a shell prompt?
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