Figure 3. Drive Connector - Seagate ST3285N Product Manual

ST3655 Family SCSI Drives Product Manual, Rev. A 17
The drive connector is a nonshielded, 50-pin connector consisting of two
rows of 25 pins with adjacent pins 0.100 inches apart. The connector is
keyed with a slot. The connector is shown in Figure 3.
2.84 max
0.02 radius (typ)
0.26
0.310 max
0.08
0.02 radius (typ)
0.015
0.160 0.025 ± 0.002 0.100 typ
0.120
02.40
0.54 max
0.28 max
0.230 ± 0.003
0.260
0.100 0.100
0.360

Figure 3. Drive connector