I’ve tested several enclosures featuring the JMS579 against more expensive alternatives. Here is the verdict:
*TRIM pass-through supported in newer firmware revisions. jmicron jms579
This is the most critical feature. Older USB enclosures used a protocol called "BOT" (Bulk-Only Transport), which was inefficient. The JMS579 supports (USB Attached SCSI Protocol). jmicron jms579
Its job is translation. It takes the SATA signal used by internal hard drives and SSDs and translates it into a USB signal that your computer can understand. jmicron jms579
In this post, we’re looking at this ubiquitous little chip to see why it has become the industry standard for external storage solutions, and whether it holds up against modern demands.