Reference_Design_Library/3.5 Hard Drive 50-pin SCSI PCB
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3.5 Hard Drive 50-pin SCSI ED 100 v1.0

3.5" Hard Drive 50-pin SCSI PCB

This reference design is for a 3.5" hard drive 50-pin SCSI PCB with standard spacing for the power and SCSI connectors.

The standard spacing allows the use of the special hard drive connector used on some models of the Macintosh like the Perform/LC 520, 550 and 575.

There are four different reference PCBs to suite the needs of various projects:

  • 3.5" Hard Drive 50-pin SCSI ED

  • 3.5" Hard Drive 50-pin SCSI TH

  • 3.5" Hard Drive 50-pin SCSI ED 100

  • 3.5" Hard Drive 50-pin SCSI TH 100

The TH model uses through hole mounting of the connectors. The ED version uses edge/straddle mounting of the connectors. The 100 version of the boards are within the 100mm x 100mm max many PCB manufacturers put as the limit for cheap prices.

Note: The shroud for the TH 50-pin connector will need to be removed and flipped after soldering the connector to the board. Alternatively you can use a connector with no shroud.

The mounting holes of the 3D printed PCB holder is based off of SFF-8301 Specification for Form Factor of 3.5" Disk Drives Rev 1.6, Quantum ProDrive 40S/80S specs and the IBM Ultrastar ES DORS 32160 spec. This should cover the variations of the placement of mounting holes over the years.

PCB Bill of Materials for ED Version

Quantity Description Designator Product Number Datasheet
1 2 x 25-pin male header straight through-hole J1 350211-1 pdf
1 Mate-n-Lok 4-pin female straight through-hole J2 302-S501 pdf

PCB Bill of Materials for TH Version

Quantity Description Designator Product Number Datasheet
1 2 x 25-pin male header right angle through-hole J1 30350-5002HB
PREC025DBAN-M71RC (without shroud)
pdf
pdf (without shroud)
1 Mate-n-Lok 4-pin female right angle through-hole J2 770846-1 pdf

3D Models

As usual I try to minimize the need for support and only the top case needs them for where the screws go. Choose whatever infill percentage you desire. The top cover screws are M3 which are used by CD drives and floppy drives. The side and bottom screws are sized for standard #6-32 UNC screws used to mount hard drives. The holes are tapered to help tapping the holes with the screws.

Edge Connector PCB Cases

Full size case with openings
Tinker Different
download
Full size case with openings
Tinker Different
download
100mm pcb case
Tinker Different
download
100mm pcb case with openings
Tinker Different
download

Edge Connector PCB Cases

Full size case with openings
Tinker Different
download
100mm pcb case
Tinker Different
download
Full size case with openings
Tinker Different
download
100mm pcb case with openings
Tinker Different
download

Case Bill of Materials

Quantity Description
6 M3 pan head screw 5mm - 7mm

Case Bill of Materials for 100mm PCB

Quantity Description
4 M3 pan head screw 5mm - 7mm

Todo

  • Add schematic symbols for the SCSI and power connectors
  • Create 3D model to help align connectors when soldering

License

Creative Commons License

Reference Design Library by Alexandre Marcoux is licensed under a Creative Commons Attribution 4.0 International License.

Community

For more great retro hardware projects and a great community check out:

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