Replacing a hard drive in an old computer with solid-state storage can greatly improve performance. Here is a list of options for replacing a drive, including what each one is best for.
The ZuluSCSI uses a disk image system for SCSI emulation that allows for easy backups and transfers of files between systems and emulators. This approach was originally pioneered by the BlueSCSI team, with the ZuluSCSI enhancing it with more features, better hardware design, and greatly improved performance. Information on vendors is available at zuluscsi.com.
The BlueSCSI V2 is a clone of the ZuluSCSI with some added features. Both platforms run on open-source software, but the hardware design of the BlueSCSI is also open, meaning that you can get the PCB Gerber files and BoM information to build your own from scratch. They also have the addition of a few new features for file transfer, and are currently the cheapest option for drive replacement. Information about licensed vendors, or building your own, is available at their website.
There is also currently a beta WiFi emulator available. Information on that can be found here.
The PiSCSI uses a raspberry pi, along with another board to emulate a wide variety of SCSI options, including hard drives, CD-ROM drives, and even an ethernet adapter, to get an old Mac online. They are available in external and internal varients, and they can be controlled via a web interface, which makes them (in my opinion) the best solution for external file transfer from an vintage Mac to a modern computer of any kind. Information on vendors is available here.
The SCSI-2-SD was one of the first options for using an SD card in place of a SCSI drive. There are many revisions of the SCSI-2-SD, each with differing features and performance. People generally agree that it is one of the fastest replacement options, but it is also more expensive than some other options. Make sure to research which version works best for you before purchasing one!
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