Perfmon is not the place to look, you don't have disk performance problems, you have disk stability problems.
And no, the figure for bytes/write is not milliseconds. It's bytes. It shows the average number of bytes written per second.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability