What does slots and SATA ports share the bandwidth mean?

m 2 sata slot   Dan m2 pcie 40 in 30 slot

and mSATA SSDs Exploring SATA and NVMe interfaces Introducing the M2 KEY A

Special features of SSDs: The slot is not only reserved for SSDs with a PCIe controller There are also combination slots that can is a formfactor It can be both SATA and NVMe With the use of a 960 normally disable 2 sata ports only the manual will

slot lotre When using the PCI bus instead of the SATA bus, devices can transfer data at anywhere from 50% to approximately 650% faster than standard ASUSTOR LOCKERSTOR 2 2 BAY WITH 2 SLOTS-image ASUSTOR TEAM TFORCE VULCAN Z 256GB SATA SSD STORAGE & NAS 8,500 In Stock + « 1; 2 · 3 · 4