Background: I have a XP SP2, all updates, system with 1 - 160Gb drive partitioned with 2 partitions, 152Gb/8Gb, along with 4 - 250 Gb drives to be used in a RAID 10 (SIL3114). Description: Set up the 4 drives into RAID Set 10 using BIOS Utilities (ASUS MB). Booted onto CD built using Acronis 10 . It complained that it could only handle RAID 0. Rebuilt arrany using 2 drives in a RAID 0, just to see if it would work. Copy went fine. Very fast when I booted up. The proportional transfer worked great creating partitions of 450Gb/17Gb. Now, threw that away and started again to use a RAID 10, read how the Windows version would use windows drivers which I had installed. Went into Windows using 160Gb drive and brought up Acronis 10. Set everything as before and it did recognize the RAID 10 configuration. I started the transfer wizard and checked the partitions, now it is all wacky at 152Gb/313Gb. I go back and restart the wizard going manual. I get into the resize screen and take the second partition down from 313Gb to 15Gb, no problem with the unallocated space between partitions one and two. Go around to partition one, and cannot resize it. The cursor shows a hand, not a resize tool on the graphic and the spin controls are greyed out on the partition size box with the before and after boxes just fine. I can put space before and after, but I can't change its size, period, end of story. I did notice that there is a RED C on the graphic control on the top left of the color bar on the partition. I rebooted tried again, and same result. Finally just did the copy using the wacky partition size on one and bumped partition two down to 15 Gb since Acronis deigned to do that. After booting using the new RAID 10, I used used Partition Magic to fix the sizing on partition one. The RAID is now working just fine. Question: Why would Acronis make the partition change for me fine three or four times and then stop working? Does anyone know what the Red C is all about? I tried looking it up in the help (I do read documentation!) and could find nothing.