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JDW | Recapping an MMI 10MB Hard Drive [Part 1 of 3] @JDW- | Uploaded February 2021 | Updated October 2024, 3 hours ago.
In Part 1 of this series, see me change the electrolytic capacitors on a vintage 1985 10MB Microcomputer Memories Inc. M112 hard disk drive. Tell me in the comments if you know which Apple Macintosh computers this HDD was used in!
🎬 Part 2 (PSU Recap): youtu.be/19n_qTfP7Vw
🎬 Part 3 (GCC HyperDrive): youtu.be/9c2eMR5h_NI

🔍 INDEX
0:00 Intro
4:59 Drive Overview
9:14 Disassembly
11:49 Recapping
25:07 Reassembly
27:49 Power-up Test
28:56 Closing Words

🛠️ THINGS TO BUY:
• Electrolytic Capacitors (6pcs total): bit.ly/3rlppFB
💁‍♂️I suggest you also order capacitors for other projects to possibly qualify for free shipping.
• Phillips Screwdriver (+) to remove circuit board.
• Cotton Swabs, for cleaning off flux with alcohol.
• 99% ISO Alcohol (Spray Bottle!): amzn.to/3ae4fG6
• 99% ISO Alcohol: amzn.to/3NoFkxN
• 99% ISO Alcohol: amzn.to/2YsK8v3
💁‍♂️I gave you 3 alcohol choices above because it's often out of stock. 70% will work, 91% is better, but 99% is best for electronics cleaning (fast drying & no residue).
• Anti-static pad with Wrist Strap (16x24" / 41x61cm): amzn.to/3bfAE9Z
or
• Hi-temp Anti-static pad with Wrist Strap (16x12" / 41x30cm): amzn.to/2SOm1nK
• Wall socket Ground adapter for banana-jack Wrist Strap: amzn.to/2Yvq5ge
• Needle Nose Pliers: amzn.to/2U9Kc0M
• Wire Nippers 4.5": amzn.to/2J4Wkdk
• Soldering iron with °F-only LCD & Solder Kit (80W, cheap!): amzn.to/36BYi0K
or
• Soldering Station (120W, ESD safe -- very similar to my Hakko 937): amzn.to/30g1Frt
or
• HAKKO (Japanese) Soldering Station (70W but with ceramic core): amzn.to/2YvIo42
• Solder (Leaded Rosin Core 1.6mm): amzn.to/3IGuxxm
• Solder (Leaded Rosin Core 0.82mm): amzn.to/3GzJbVl
• MG Chemicals FLUX: amzn.to/3kuAcsZ
• Desoldering wick: amzn.to/3iMAnA5
• UV Solder Mask (covers exposed PCB traces): amzn.to/3hogoaE
💁‍♂️Set soldering iron temperature to 350°C normally. Don't use lead-free solder.
• DE-5000 Handheld LCR Meter: amzn.to/2ScttJz
💁‍♂️The best handheld meter to check capacitor ESR, capacitance, etc. Includes all 3 accessories: TL-21, TL-22 & TL-23.

💵 NOTE: Your price on Amazon (US only) is the same even if you don't click the "amzn.to" Affiliate links above, but if you do kindly click and purchase within 24 hours, Amazon may pay me a small commission on all qualifying items in your Cart (even items not linked above).


📚 MMI HISTORICAL REFERENCE
• Drive Spec Manual at Computer History Museum (CHM): bit.ly/3tp3fUO
• MMI Ad showing specs like ST-412 Interface (search the PDF for "MMI"): bit.ly/3rgDVy9
• Drive Specs on TheRef (archived): bit.ly/2MOfOYK
• MMI Incorporation Documents (click links under "Recent filings..." ): bit.ly/3oQPquR
• Financial condition, company move in Aug. 1985: https://lat.ms/39FAStm
• Dec.1984 Product Announcement (search PDF for "microcomputer"): bit.ly/3cBt0eA
• MMI portable HDD ad: bit.ly/3odv7qY
• Hard Drive Bible: see pp.168-169 on slider: bit.ly/3cBzD08
• MFM HDD Replacement #1 (requires BeagleBone Green): pdp8.net/mfm/mfm.shtml
• MFM HDD Replacement #2 (more expensive than #1): drem.info/tech-info

📚 15-YEAR SERVICE LIFE FOR ELECTROLYTIC CAPACITORS
• Nichicon Life Calculator (15 years max!): bit.ly/3axtZJQ
• Rubycon (search for "15"): bit.ly/2NQjh9F
• Elna (search for "fifteen"): bit.ly/3jaE6bs
• Nippon Chemi-Con (search for "15 years"): bit.ly/3pIwG1z

⬇️ I dumped the drive's EPROM using a T48 Programmer in May 2024: tinyurl.com/3vb39fjv

🎦 How to Choose Capacitors for Recapping: youtu.be/6PKaj9-1xIs

🙏 HUMBLE & SINCERE THANKS to Stephen in San Francisco for his extremely generous contribution by Paypal in Jan. 2021. Be sure to check out his 3D printable vintage Mac parts on MakerBot Thingiverse. Get them from Shapeways if you don't have your own 3D printer.
thingiverse.com/stephenlulz/designs

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paypal.me/supportJDW

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#harddisk #hdd #retro #JDW
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Recapping an MMI 10MB Hard Drive [Part 1 of 3] @JDW-

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