Author Archives: Michal Necasek

How Not to Erase Data

Posted on August 16, 2021 by Michal Necasek

From past blog posts it is fairly obvious that the OS/2 Museum occasionally purchases used hard disks. Most of the time, the disks are either completely erased (overwritten with zeros) or don’t have anything very interesting on them. But sometimes … Continue reading →

Posted in DOS, PC hardware, Storage | 17 Comments

The IBM PC, 41 Years Ago

Posted on August 10, 2021 by Michal Necasek

No, the OS/2 Museum does not have either a time machine or difficulty doing basic math. As of this writing, it is August 2021 and the IBM PC was announced in August 1981, 40 years ago. But in August 1980, … Continue reading →

Posted in 8086/8088, BIOS, DOS, IBM, Intel, PC hardware, PC history | 60 Comments

IDENTIFY Ancient DRIVE

Posted on July 22, 2021 by Michal Necasek

This article will attempt to collect IDENTIFY DRIVE dumps from antique IDE drives, with running commentary. For the purposes of this list, “antique” is defined as a drive model released in 1990 or earlier, typically with the drive itself also … Continue reading →

Posted in IDE, PC hardware, PC history, Storage | 9 Comments

Learn Something Old Every Day, Part II

Posted on July 17, 2021 by Michal Necasek

The ultimate reason why I pulled out the old Seagate ST-225 drive was because I wanted to try connecting it to the Western Digital WD1003-IWH board that I recently acquired. The WD1003-IWH is a curious evolutionary half-step between ST506 interface … Continue reading →

Posted in IDE, PC hardware, PC history, Storage | 11 Comments

Learn Something Old Every Day

Posted on July 14, 2021 by Michal Necasek

More or less by accident I found myself writing a very basic DOS utility to read data off of an IDE drive. It started out by just issuing the IDENTIFY DRIVE command and capturing the data, but adding the ability … Continue reading →

Posted in Documentation, PC hardware, PC history, Seagate, Storage | 3 Comments

Dirty Work

Posted on July 9, 2021 by Michal Necasek

As I’m slowly archiving my giant pile of floppies, I naturally come across specimens that have one kind of problem or another. After going through hundreds of floppies, I can safely say that 3½″ floppies are much less prone to … Continue reading →

Posted in Archiving, Floppies | 5 Comments

Centaur Close-ups

Posted on July 2, 2021 by Michal Necasek

Readers have expressed interest in seeing what exactly a Western Digital ‘Centaur’ drive looked like. I took a few photos of a WD95044-A drive, the larger capacity (40 MB) and newer variant of the WD Centaur family. Some photos were … Continue reading →

Posted in PC hardware, PC history, Storage, Western Digital | 3 Comments

Recalibration Needed

Posted on June 25, 2021 by Michal Necasek

The OS/2 Museum recently acquired two horribly slow old Western Digital IDE drives model WD93044-A. These were WD’s first foray into IDE hard disks, combining a rather outdated Tandon RLL drive chassis (3.5″ half-height stepper drives) with WD’s own controller … Continue reading →

Posted in Bugs, IDE, Western Digital | 32 Comments

Can This Conner Talk?

Posted on June 18, 2021 by Michal Necasek

As part of research into the IDENTIFY DRIVE command, the OS/2 Museum acquired two old Conner IDE drives, a CP-342 and a CP-341i. These drives look extremely similar at first glance, and they’re both 40 MB IDE drives, but on … Continue reading →

Posted in Conner, Debugging, Hardware Hacks, Storage | 19 Comments

OS/2 6.304: Who Has More?

Posted on June 11, 2021 by Michal Necasek

Yet another interesting item that I recently ran through a Kryoflux is a set of 30 floppies labeled “IBM OS/2 Version 2.0 Pre-release Evaluation Copy – 6.304”. In this case, there’s no mystery as to what it is: 6.304 was … Continue reading →

Posted in Archiving, IBM, OS/2, Pre-release | 8 Comments