Latency on boot drive?

ESXi is reporting latency on one of my host's boot drives, on the order of 250ms sometimes.  Why would this be?  I thought everything was loaded into RAM after boot?

Could the drive be going bad?  Maybe I'm running too many VMs on the machine?

Note this is a stock SATA 7200rpm drive the machine is booted off.  Thanks for any help!

- John

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