A rhyming rule of thumb warning technicians against using molded Molex-to-SATA power adapters. These specific adapters are notorious for internal short circuits caused by the injection molding process pushing the wires too close together. When they fail, they often catch fire or send destructive voltages into the attached storage drive, destroying the disk and its contents.
Heard on the job
I saw you wiring up that old rig with an adapter, just remember: Molex to SATA, lose all your data.
Insider tip
The danger is specific to adapters with molded plastic SATA connectors; crimped SATA connectors are generally safe.