Changing BIOS drive order results in misleading inconsistent size error

I inadvertently changed my drive order, and was completely unable to load my previously constructed flashcache device; it misleadingly reported a size inconsistency (presumably due to seeing an unexpected partition size and/or type on /dev/sdb1). Reverting the drives to the original order corrected the problem.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: flashcache-utils 1.0+git20130722-1
ProcVersionSignature: Ubuntu 3.11.0-8.15-generic 3.11.1
Uname: Linux 3.11.0-8-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.12.5-0ubuntu1
Architecture: amd64
Date: Mon Sep 30 12:21:14 2013
InstallationDate: Installed on 2013-09-22 (8 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha amd64 (20130921)
MarkForUpload: True
SourcePackage: flashcache
UpgradeStatus: No upgrade log present (probably fresh install)