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When Backup Runs, Windows Reports Backup Target Disk Removed
My Win 7 x64 machine (Dell) has three hard drives in it. The original 2TB Seagate with the operating system on it, C:, a 2TB WD used for data storage,F:, ..and a 1TB Seagate repurposed from the XP computer it replaced. That last drive contains only data as that was its purpose in the previous machine. There are no programs on it and it's formatted NTFS.
On boot-up, the computer sees the 1TB Seagate as drive E: and it functions just fine until it's time for a Windows Backup. About 30 seconds into the backup, I get the message that "Intel Rapid Storage Technology has detected a disk removed on Port 3." At this point, the backup fails and Windows no longer sees the E: drive until next cold boot. The backup's target is an external Seagate drive J: that is unaffected by any of this.
Yes, I've changed SATA cables. I've changed the Motherboard connection where the E: drive's SATA cable is attached. I've reversed and rerouted cables so there's no odd pressure on any one of them. I've disabled the power-saving settings so the disc spins all the time. Nothing helps.
The E: drive functions just fine until Windows Backup starts, then it acts as if I removed it.
Error code from Windows Backup dialog is 0x80070002 "The system cannot find the file specified."
Suggestions?