The Adaptec card is basically an easy way to connect the Seagate discs after i have chucked them out of their boxes, at least this was my inital plan. Yes i got they purely from a cost perspective (was 269$ on sale in my country).
I use a staging disk between the 2x2TB M2 temp discs and the final storage (HDD), this is so that two (or more) plotters do not try to write to the same HDD at the same time. It will cause a huge bottleneck when running in paraell. I then have a simple bat file checking for new *plot files on the staging disc every 30s and then move them to the HDD’s.
CABLEDECONN Internal HD Mini SAS (SFF-8643 Host) to 4X SATA (Target) Hard Drive Cable (100CM)