Storage · The Beige Era · 1986
Apple Hard Disk 20SC
The 20SC moved Mac external storage onto SCSI, the fast and fussy bus that would define Mac peripherals for years.
Apple Hard Disk 20SC: key facts
When was the Apple Hard Disk 20SC released?
The Apple Hard Disk 20SC was released in 1986. Apple discontinued it in 1989.
How much did the Apple Hard Disk 20SC cost?
The Apple Hard Disk 20SC launched at $1,299 in 1986 — about $3,793 in today’s money (approximate, US CPI).
What are the Apple Hard Disk 20SC’s specs?
The Apple Hard Disk 20SC used a N/A, with None of memory and 20 MB of storage. It ran Driver / firmware support.
Why does the Apple Hard Disk 20SC matter?
First SCSI hard disk for the Macintosh Plus generation.
Full specifications
| CPU | N/A |
|---|---|
| Cores | — |
| Memory (RAM) | None |
| Storage | 20 MB |
| Display | None |
| GPU | N/A |
| Ports | SCSI |
| Weight | Varies by model |
| Dimensions | External SCSI hard disk |
| Operating system | Driver / firmware support |
| Released | 1986 |
| Discontinued | 1989 |
| Launch price | $1,299 |
How the Apple Hard Disk 20SC compares to today
All of this storage holds about 5 modern phone photos.
Launched at $1,299 in 1986 — about $3,793 in today’s money (approx., US CPI).
Cross-architecture speed figures are clock-only and approximate; inflation figures use US CPI.
Did you know?
It is the kind of model collectors use to map Apple’s complicated family tree.
Related Storage models
Open the Apple Hard Disk 20SC in the interactive archive →
Last updated: 2026-06-27