A technician wants to run a portable, bootable diagnostic tool on user workstations. Which of the following should the technician use to achieve the goal without overwriting the workstations' local OSs?

Solid State Drives (SSDs) are storage devices used to store data, but they require installation within the machine to function. An SSD cannot be used to run a bootable diagnostic tool without being connected internally, which would overwrite or interfere with the existing OS.

SATA (Serial Advanced Technology Attachment) is an interface used for connecting storage devices like HDDs and SSDs to the motherboard. It does not represent a bootable medium itself and cannot be used directly to run diagnostics without an appropriate storage device.

SCSI (Small Computer System Interface) is a set of standards for connecting and transferring data between computers and peripheral devices. Like SATA, SCSI does not provide a means to run a bootable diagnostic tool independently; it requires a compatible device to be effective.

Hard Disk Drives (HDDs) are traditional storage devices that can also store operating systems. Using an HDD for diagnostics would require it to be the primary drive, which risks overwriting the local OS. Thus, it is not suitable for running a portable diagnostic tool without affecting the existing system.