Fragmentation over time and TRIM
Fragmentation Over Time:

A few performance snapshots taken throughout our testing:

Plextor PX-128M1S Solid State Drive Review - Storage 40

Fragmentation effects seen from after our battery of tests.  Reads were unaffected.

Plextor PX-128M1S Solid State Drive Review - Storage 41

A second pass shows writes returned mostly to normal.

I noticed writes seemed faster during the HDTach passes we took prior to our testing, so here is the sequence starting witha completely wiped unit:

Plextor PX-128M1S Solid State Drive Review - Storage 42

First pass shows a weird step-decrease on write speeds.

Plextor PX-128M1S Solid State Drive Review - Storage 43

Second pass shows writes stabilizing.

Plextor PX-128M1S Solid State Drive Review - Storage 44

Plextor PX-128M1S Solid State Drive Review - Storage 45

After a couple more passes the drive stabilizes out near its rated write speed.

Here is a before / after ATTO pass to show how the effect at a more realistic level:

Plextor PX-128M1S Solid State Drive Review - Storage 46

Before.

Plextor PX-128M1S Solid State Drive Review - Storage 47

After writes have stabilized.

TRIM:
 
This controller does not support native TRIM, so there is nothing big to report here.  That said, write speeds stuck fairly close to their rating even after heavy fragmentation.  This is partially attributed to a mild level of background garbage collection employed by the Marvell firmware.  It does not bring writes back to ‘new’ speed, but it helps them stick close to its 70 MB/sec rating.
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