The BIGGEST Hard Drive I've EVER Had | SM5400 Bulgarian HDD

Published 2024-08-04
Today, we have a massive piece of computer history in quite a literal sense. This is one of the very first Soviet hard disks, the CM 5400, produced in 1986 in Bulgaria. These drives were widely used in multiple PDP-11 compatible systems across the Chernobyl Zone.

00:00 – Well, this is a device.
01:14 – Spoiler alert!
02:20 – Overview
04:26 – Where were these drives used?
06:17 – Accessing the built-in disk
07:31 – Cleaning system
09:07 – Heads assembly and monster capacitors
10:48 – Removable disk
11:58 – Outro
12:56 – Obligatory cat performance

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All Comments (21)
  • The storage data hardrive system was invented by a Ukrainian American Lubomyr Romankiw who worked for IBM . There's two American Ukrainians that set up Apple Computers that's Steve Wozniak and James Yurchenko, Steve Wozniak showed Lubomyr Romankiw his prototype computer and Romankiw pointed that there's 9 patents that was IBM so later Apple and IBM came to an agreement and thanks to all 3 inventors we have PCs .
  • @DeKempster
    What a day, Usagi also uploaded a HDD video.
  • @a-z-n-b-a-i
    My father worked about 10 years as a night shift operator at the "main computation center of the ministry of argriculture" in Kyjiw. Changing the disk drums and wiping the reading heads with ethanol comprised the most part of the maintenance cycle for those disk drive machines. The need for "consumables" related to the second duty was exaggerated by orders (they wrote off several liters for every cleaning, for which a few of modern alcohol wipes would suffice). This resulted in a constant stream of unaccounted ethanol spirit for a lot of ГИВЦ workers (during gorbie prohibition). Everybody was in the game, including the director, who regularly and gladly ordered supply increases as requested the technician team. Even passionate drinkers could not keep up with that amounts, so after some initial hamstering they started to equip the relatives and friends with the stuff. My grandparrents and uncles coud not see that substance after a while a still had some a decade later, like untill the middle of 90s.
  • I really cracked up by your face when the cat entered the table!😂😂😂😂 Keep the humor up in heavy times my friend!
  • Great video. Getting anything made under the circumstances is jaw dropping. Wishing you well.
  • @hyperspaced0
    It looks similar to Centurion’s HAWK drive. It had 5MB fixed platter and 5MB removable platter placed on top
  • @Jhihmoac
    Goes to show how far we've come in computer technology when drives that do 1000 times more are mostly solid state chip construction and about 1000th the size as what they had back then...
  • Man, I wish it was possible to get you and Usagi Electric in the same room. Talk about a teamup made in heaven! And hey regardless of how fast the videos come, bless you all there, and be well. Love the content regardless!
  • @a-person100
    another great video showcasing neat soviet electronics loved the parts when your cat showed up :)
  • Good work saving the drive. History brings proper perspective on the present. These style drives were common in the Centurion computers.
  • @technologic21
    That is incredible! Disks in those days were the size of a vinyl records!
  • @senor_n
    Hello Alex!! Thanks for the subtitles!! I need it. 😉
  • @RustBunny
    Well, the table held up to the weight of the hard drive and your cat didn't try to knock it off the table, unless there is footage you're keeping from us.
  • @korolchukpp
    Спасибо за обзор такого древнего и чудного девайса!
  • @Damien.D
    I think you've broke the record for the heaviest hard drive on YouTube. Seems "bulletproof" was part of the design requirement. The build quality looks pretty good by the way. Never seen such high capacity on a single capacitor also.... These things are monsters, wonder if they've dried up? Would be fun to try to measure them. I've got pinball machines in my collection that are older than the Chornobyl disaster, still with the original caps. Works flawlessly.
  • @glurfikus5544
    So infact this 25mb Behemoth has more weight than my whole equipment today . For me as a noob it looks a little bit like a laserdisk with this immense proportions. Anyway, as usual, very interesting video. Regards from Berlin
  • @neil4306
    As always a wonderful video 😊
  • @professionalvr
    Also here is something interesting: In some Bulgarian towns and villages, the internal disks from IZOT hard drives were repurposed as makeshift TV antennas.