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[GH-ISSUE #64] RX1216sas SFF-8088 to MiniSAS HD SFF-8644 support #69
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Originally created by @TheUltimateC0der on GitHub (Nov 28, 2025).
Original GitHub issue: https://github.com/007revad/Synology_enable_eunit/issues/64
Is it potentially possible to support the RX1216sas that has the (as the name implies) SAS (Mini SAS SFF-8088) connector in combination with models that have the Mini SAS HD SFF-8644 connector ?
For example the DS3622xs or other RS models have this connector on the back for expansion.
@ctl26481 commented on GitHub (Jan 16, 2026):
RXsas use SAS so SFF-8088 is used to prevent people from plugging incompatible expansion units into them. Because SAS is not compatible with SATA Multipliers and vice versa. Excluding SAS expansion units, Synology just borrowed the SFF physical connectors and run SATA on them.(i.e. SFF-
86438644 on the back of DX3622xs is purely 4x SATA, meant for DX1222 with 4x 1-to-3 SATA Port multiplier)@007revad commented on GitHub (Jan 20, 2026):
Interesting. I have a spreadsheet of Synology models hardware features including expansion port type. One day I noticed that a couple of them had Mini SAS and all the others had Mini SAS HD. I thought it was typo and changed Mini SAS to Mini SAS HD.
So is: