Do SSDs suffer from fragmentation?
Is there an advantage to it? I mean, SSD is essentially random access memory.
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Since it takes the same time for a SSD to find any file on it (unlike mechanical hard drives where access time can vary depending on where the file is physically located on the platter), there is no reason/need to defragment a SSD.
Additionally, defragging a SSD will decrease the life span of the drive (SSD's have a limited life based on read/writes to the drive). For a more detailed SSD's and how they work, read this article.
No need to run defrag on any SSD since random and sequential read times as well as sequential write times are not affected by file fragmentation. The randon write times of several SSDs (with the notable exception of the intels) apparently do get affected by free space fragmentation, so some utility that addresses this by free space consolidation may be useful. Unfortunately, the Windows defragger has no such option AFAIK, but there are some commercial defraggers with add-ons that optimize the SSD automatically.