What are the symptons of macbook pro hard drive not running fast enough

what are the symptons of the hard drive not running fast enough

Physically the drive will be as fast as any other of its class, and if not then it's experiencing a mechanical issue that should prompt a warning or two in the system, especially if you use a drive management tool like Disk Utility that checks the drive's built-in "S.M.A.R.T." diagnostics.
As for "logical speed," if there are bad blocks on the drive where sectors cannot be read or written to because of a breakdown of the storage medium, then this can result in a program or the entire system crashing or hanging (generally the latter is the case), where it usually pauses for a number of seconds at a time. This is usually accompanied by messages that state "I/O Error" or other similar warning in the OS X Console (in the Applications > Utilities folder).
Beyond this, drive formatting errors such as might happen after a crash or power outage can result in similar hang-like behavior, though this is usually not as distinct of a hanging behavior as is seen with bad blocks.
Finally, if the drive is simply full of files or highly fragmented (not as much of a problem in OS X, but it can happen), then this can reduce access time for reading and writing files, and prevent the system from optimizing the use of RAM, which can result in overall slowdowns. Heavy drive use can also cause similar bottlenecks, but this is ususally only an intermittent issue during a time when you are performing a heavy file transfer or copying process, or other task that occupies access to the drive's index and formatting (e.g., if you check it for errors with Disk Utility, then you may see the system pause or slow down during the check).

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