How many of you remember PDCD

Discussion about old PC hardware.

How many of you remember PDCD

Postby Vipersan » 2018-2-07 @ 13:46

Probably one of the most durable media storage systems I've ever encountered..
Sadly not much out there about them ..
they came in various capacity the most useful /convenient being the 650mb discs.
The discs came with preformatted sectors ..in a plastic enclosure which only opened when in use..the disc surface being delicate and not to be handled.
The forerunner of CD ..it used a Magneto Optical system to write and read data...thus the drives were complex.
They came in two flavours ..sscsi and ide ...and most often used for system backup ..like a DDS tape drive.
..though you could write media files to them with the right software ..like backup exec ..back in the win98 days.
What _is_ impressive about these discs is the data retention/degradation factor ..
I have yet to find ANY data loss after 20+ years..
you can't say that about die based CD.
The drives and media were ridiculously expensive...and probably the main reason it didn't catch on.
certainly too expensive for domestic use.
So ..I have only one scsi version ..and 2x ide pdcd drives ...and only 7 discs.
nonetheless ..it is a most impressive system ..and the drives also read an write standard CD..
The overlap period I guess.
Anyone else used or using one of these drives ?
rgds
VS
https://www.youtube.com/watch?v=7jo0oM0KFSI
https://www.youtube.com/watch?v=qykP7umSYus
Last edited by Vipersan on 2018-2-07 @ 14:45, edited 3 times in total.
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Re: How many of you remember PDCD

Postby derSammler » 2018-2-07 @ 13:55

Used them for years for backup and still have many discs. After that, I got an early DVD-RAM drive which could read PD as well. Still own that, and it still works. :)
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Re: How many of you remember PDCD

Postby Kubik » 2018-2-07 @ 14:05

If you mean the MO drives, I do remember them, I even have four drives (3,5", 230MB and 640MB) and a box of medias. I have used one of the drives recently to install MacOS on an older Mac (Performa 475 or something similar).
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Re: How many of you remember PDCD

Postby derSammler » 2018-2-10 @ 15:42

No, PD is not MO!
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Re: How many of you remember PDCD

Postby Vipersan » 2018-2-10 @ 16:18

Just found another clip ..
closer with this one ..
A PD/DVD drive.
Still not PD/CD ..but closer..
https://www.youtube.com/watch?v=rDvNBmrTONw

..and this one showing how it is possible to boot Win98 direct from the PD drive ..
https://www.youtube.com/watch?v=khE8prDB9VI

of ..course ..not my native language so I can only watch the moving images
lol
PD ..standing for Phasechange Dual ...very similar to MO ..but in my opion a more durable data storage system.
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