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#1 2017-02-02 08:47:35

elppa
Member
Registered: 2017-02-02
Posts: 6

HD replacement in 20SC

Hi all,

I posted this on "Mac Rejuvenators" FB group, but then found this forum and it seems the audience is wider here -- so reposting.

I'm about to replace a SCSI disk in my 20sc drive which just failed with a LOT of noise.

I bought a SCSI disk (http://allegro.pl/show_item.php?item=6598122888) and an adapter like this one: http://allegro.pl/show_item.php?item=5653157120.

Hopefully they will work together, and with 20sc enclosure... Anyone has done this before? Any tips?

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#2 2017-02-20 18:54:47

bobo68
Member
From: Germany
Registered: 2015-07-07
Posts: 22

Re: HD replacement in 20SC

You have to try. These wide SCSI drives often have termination issues when used with the simpler adapters. There are others that terminate open lines.

I'd go for a more conservative SCSI drive - less RPM and size, SE (and not LVD), narrow (8 bit), maybe 50-pin - or something like the SCIS2SD. Also have a look at the power the drive needs. It shall not stress the old power supply too much.

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#3 2017-03-23 09:43:38

elppa
Member
Registered: 2017-02-02
Posts: 6

Re: HD replacement in 20SC

Hi bobo68. With a delay, but thank you for the response. Now I'm updating this thread for the record: yes, the setup which I asked about worked perfectly on Macintosh SE. The only problem I encountered was software-related: neither the regular Apple SC HD Setup, nor the patched version of it (!) could recognize the SCSI disk properly. But I managed to initialize and partition the disk using Lido 7.56. Now everything is working fine, the 36-gigabyte disk has 4 partitions, each around 2 Gigs. I didn't create more, because there's no chance I'll even fill the 4 I already have smile

Thanks again.

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#4 2017-03-23 16:08:29

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,406

Re: HD replacement in 20SC

If I need to upgrade mine, I'll be using something like this  .  .  .

IDE-SATA-ADAPTER-237.jpg

.  .  .  from one of my IDE-> whatever adapters as a replacement power supply.


edit: unclear: it'd be hacked inside the case next to a SCSI2SD with the original PSU intact (stored in place) other than whatever needs to be unplugged/desoldered to hook the replacement up to the power switch. It should have plenty of juice to use a splitter to power a fan.

Last edited by jt (2017-03-23 16:16:32)

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#5 2017-03-23 16:12:04

elppa
Member
Registered: 2017-02-02
Posts: 6

Re: HD replacement in 20SC

jt, if you are replacing the disk as I did, within the 80SC enclosure, then you don't need an external power supply -- the required Molex connector is available from the internal power supply.

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#6 2017-03-23 16:32:23

jt
Member
From: Bermuda Triangle, NC USA
Registered: 2014-05-21
Posts: 1,406

Re: HD replacement in 20SC

Yep, but I'd be taking the original power supply offline for "storage in place" with a reversible hack so as not put any more hours on it.

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