Quantum ProDrive ELS85S 85MB SCSI-2 front view Quantum ProDrive ELS85S 85MB SCSI-2 front view
Quantum ProDrive ELS85S 85MB SCSI-2 front view Quantum ProDrive ELS85S 85MB SCSI-2 front view
Quantum ELS85S top view Quantum ELS85S top view
Quantum ELS85S angled view Quantum ELS85S angled view
Quantum ProDrive ELS85S 85MB SCSI-2 front view
Quantum ProDrive ELS85S 85MB SCSI-2 front view
Quantum ELS85S top view
Quantum ELS85S angled view

Quantum

Quantum ProDrive ELS85S – 85MB | SCSI-2 50-Pin | 3600RPM | 3.5" | Legacy HDD

$115.00

Brand New, Factory Sealed | In Stock | Bulk Orders Available

The ProDrive ELS85S is an 85MB SCSI-2 hard drive featuring 3600RPM spindle speed, 32KB cache, and 17ms average seek time in a 3.5" form factor. Built for early 1990s workstation and professional systems, it is ideal for legacy system restoration, vintage computing projects, and Apple Macintosh system upgrades. Compatible with SCSI-2 single-ended controllers, Apple Macintosh systems, and various UNIX workstations. The drive implements advanced Reed-Solomon error correction and includes automatic head parking for enhanced reliability in continuous operation environments.

All products from Anand International ship brand new and factory sealed. Volume and B2B pricing available for qualified buyers.
Specifications
  • Manufacturer: Quantum
  • Model: ProDrive ELS85S
  • Capacity: 85MB
  • Interface: SCSI-2 Single-Ended 50-Pin
  • Spindle Speed: 3600RPM
  • Cache: 32KB Look-Ahead
  • Form Factor: 3.5" Slimline
  • Seek Time: 17ms average, 5.5ms single-track
  • Latency: 8.2ms average
  • MTBF: 250,000 hours
  • Drive Type: Internal Hard Drive
  • Warranty: 90 days
  • Shipping: Free domestic US shipping
  • Condition: Brand New, Factory Sealed
Product Features
  • 85MB formatted capacity with SCSI-2 interface
  • 3600RPM spindle speed for reliable performance
  • 32KB look-ahead cache buffer
  • 17ms average seek time, 5.5ms single-track
  • Reed-Solomon 96-bit error correction
  • Automatic head parking and lift/lock technology
  • SCSI ID jumpers for multi-device configurations
  • 3.5" slimline form factor for space-efficient mounting
  • Direct replacement for legacy systems requiring SCSI connectivity
  • 90-day Anand International warranty on all legacy stock
  • Free domestic US shipping included
  • Volume and B2B pricing available for qualified buyers
Compatibility

Compatible with SCSI-2 single-ended controllers, Apple Macintosh systems (commonly used), early PC workstations, and UNIX systems with 50-pin SCSI interfaces. Not compatible with modern SATA controllers, IDE/PATA interfaces, or systems requiring SCSI-3 or SAS connectivity.
Shipping & Returns
  • Free Shipping: We currently offer free Economy Shipping within the continental U.S. with no minimum order required. Expedited shipping is available at standard carrier rates.
  • Same-Day Shipping: Order placed before 2PM PST will ship the same day. Orders received after this time will ship the following business day.
  • Hassle-Free Returns: If you're not completely satisfied with your purchase, simply return it within 10 days for a hassle-free refund or exchange.

85MB SCSI-2 3600RPM 17ms Seek Factory Sealed

Why the ProDrive ELS85S is the right Legacy HDD

The Quantum ProDrive ELS85S represents early 1990s professional storage technology with SCSI-2 interface and advanced error correction. Delivering reliable 85MB capacity at 3600RPM, it features sophisticated Reed-Solomon ECC and look-ahead caching. This drive was commonly deployed in Apple Macintosh systems and professional workstations, making it essential for authentic vintage system restoration.

SCSI-2 Professional Interface

50-pin SCSI-2 single-ended interface with configurable SCSI ID jumpers. Supports multiple device chaining and professional system integration.

Advanced Error Correction

Reed-Solomon 96-bit error correction with automatic retry algorithms. Ensures data integrity with less than 1 error in 10^14 bits read.

Apple Macintosh Heritage

Commonly found in Apple Macintosh systems of the early 1990s. Authentic component for vintage Mac restoration and period-correct upgrades.

Reliable 3600RPM Performance

Consistent 3600RPM spindle speed with 17ms average seek time. 32KB look-ahead cache optimizes data transfer efficiency for era-appropriate performance.

New Old Stock with 90-Day Warranty

Available as brand new, factory sealed old stock units from Anand International with a 90-day warranty. Ideal for legacy system maintenance, vintage computing restoration, and hard-to-find replacement needs.

Frequently Asked Questions

Frequently asked questions for SCSI, including information on usage, configuration, and compatibility.

1. What is a SCSI hard drive?

A SCSI (Small Computer System Interface) hard drive is a legacy enterprise storage device that connects using parallel ribbon cables. SCSI was widely used in servers, workstations, and storage arrays before newer technologies like SAS and SATA became standard.
2. What systems are SCSI hard drives compatible with?

SCSI drives are designed for older servers, RAID controllers, and storage arrays that have SCSI interfaces. They are commonly used today to maintain or repair legacy IT infrastructure.
3. What’s the difference between SCSI and SAS?

SCSI uses parallel communication and bulky ribbon cables, with speeds up to 320 MB/s. SAS (Serial Attached SCSI) is the modern successor, offering serial communication, smaller connectors, dual-port redundancy, and speeds up to 24 Gb/s.
4. Can SCSI hard drives still be used in modern systems?

Most modern computers don’t have SCSI ports. To use a SCSI drive, you’ll need a compatible SCSI controller card or an external enclosure designed for parallel SCSI.
5. What capacities are available for SCSI hard drives?

SCSI hard drives were typically available in capacities ranging from a few gigabytes to several hundred gigabytes. Larger capacities are rare compared to modern SATA and SAS drives.
6. Are SCSI hard drives hot-swappable?

Yes, many SCSI drives used in enterprise servers were hot-swappable when paired with a compatible RAID backplane or enclosure. This allowed replacement without shutting down the system.
7. Why are SCSI hard drives still used today?

SCSI hard drives remain important for maintaining legacy servers, specialized equipment, and industrial systems where upgrading to newer storage technologies isn’t possible or practical.