Green Block <150ms Good Bad ???

Testing SCSI drives and I get some <150ms should I format and retest???
If I get <500ms or >500ms I always format and erase then retest. Do I need to do so with <150ms???

Whats everyones opinion???

Thanks everyone.

What model drive? Always the same block? Do you use the drive's built-in format before testing? It isn't a temp. recalibration is it?

Most are IBM ESXS SCSI drives. Various areas show <150ms. Need to know what is industry standered. Or does it vary with each company??? Would some <150ms be acceptable.
The same model drive with some <150ms will format and clear these areas and others will not. Does this mean the ones that did not clear the <150ms are going bad because of weak areas???
Any <500ms and >500ms that do not clear are scraped.
I need to know what everyone thinks about <150ms and if they do not clear up is the drive GOOD or BAD???

try low level formatting the drive of do write test with victoria .