Yes, that's formatting both drives. I haven't personally found anyplace that sell those cheaply in singles, but in sets of 10+, they are well under $2 each. I think my last order came out to about 1.30 each, but I got like 30 from a bulk supplier like monoprice. Easier to anticipate needs and overbuy, IMO. <div class="gmail_quote">On Aug 2, 2014 11:43 PM, "Chick Tower" <<a href="mailto:c.e.tower@gmail.com">c.e.tower@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> I've found on-line instructions for setting up RAID1 with two disk drives on a system already running Linux. After using mdadm to create a RAID set on two partitions already formatted ext3, they then say to issue the command mkfs.ext3 /dev/md0 Won't that erase anything already on the two drive partitions that make up md0? Also, does anyone know where to buy SATA cables cheaply? I think I need to replace one that I suspect is faulty. -- Chick _______________________________________________ linux-user mailing list <a href="mailto:linux-user@egr.msu.edu" target="_blank">linux-user@egr.msu.edu</a> <a href="http://mailman.egr.msu.edu/mailman/listinfo/linux-user" target="_blank">http://mailman.egr.msu.edu/mailman/listinfo/linux-user</a> </blockquote></div>