ReadyNas 1000S Disk 1 and Disk 3 Lights - Won't Boot

Thanks for your help. I located the rear compartment on the 1000S that holds the CF, and removed it. It was actually only 64MB. Oddly, when I inserted it into my CF reader, using Windows 7, I was required to format it. Once formatted, I decided I wasn't going to risk anything weird with newer firmware, so I tried writing 4.1.4 to it. Kept getting a prompt from NTRawrite that the firmware image was larger than the capacity of the CF. Tried a couple newer firmware versions, same prompt. Dug up an old 1GB CF, and wrote 4.1.4 to it. Was worried that the old 1000S wouldn't recognize the 1GB CF, but it did. Did a full reset, and it's in the process of Resync'ing now.

I do have one concern, though. Four 250GB disks, and previously, the ReadyNas was telling me that one drive was having ATA errors. I identified that drive, and SMART says there are 19 ATA errors. As of this moment, that's the same disk that the ReadyNAS is saying "Resync" on (disk #4). Should I just wait out the Resync, or should I assume that this disk is bad?