Measuring Earthquakes The vibrations produced by earthquakes are detected, recorded, and measured by instruments call seismographs. The zig-zag line made by a seismograph, called a seismogram, reflects the changing intensity of the vibrations by responding to the motion of the ground surface beneath the instrument.
USBFast is a software program developed by Plextor. The most common release is 1.3.0.19, with over 98% of all installations currently using this version. The setup package generally installs about 10 files and is usually about 1.02 MB (1,073,462 bytes).
Thanks for you explanation. I was also sure that Port fast is an optional feature that need to enable by administrator but some friend made me confuse So Please correct if i am wrong ... 1] So Port Fast is optional feature that can enable as per requriment, Not automatically enable when we run RSTP. 2] Port Fast can be used with STP or PVST.