Concorde1993
Well-known member
I forgot to add- JDW, the case was pretty easy to open. The only thing I had to worry about was the metal plate on the top cover that fell out as I opened the case.
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Apple SC20 Problem
- Thread starter Concorde1993
- Start date
Udo.Keller
Well-known member
Maybe I can help. Herb Johnson did a wonderful description on how to open that kind of case: http://www.retrotechnology.com/herbs_stuff/hd20_open.html
Mac128
Well-known member
Are you sure that 5.25" drive is only 20MB? Typically the 5.25" form factor drive was for the 120MB model (this is based on Apple service manuals). I am really surprised to see 5.25" 20MB drive as Apple had a deal on the 3.5" drives they were putting in the SEs at the time. Hard to believe they would go outside their deal, unless demand was that high.
As far as replacing it, have you removed it yet? The housing was designed to accommodate both standard size drive formats, so it may be a simple matter of using the same mounting screws in a different set of holes, without any additional hardware. I have the manuals around here somewhere ... will have a look to see what's required.
As far as replacing it, have you removed it yet? The housing was designed to accommodate both standard size drive formats, so it may be a simple matter of using the same mounting screws in a different set of holes, without any additional hardware. I have the manuals around here somewhere ... will have a look to see what's required.
MacJunky
Well-known member
http://stason.org/TULARC/pc/hard-drives-hdd/seagate/ST225N-21MB-5-25-HH-SCSI1-SE.html ST-225N as seen in the picture.
Concorde1993
Well-known member
Thanks for the replies.
Mac 128- I am indeed surprised that Apple used a 5.25" drive in the SC (not SE) series. I know for a fact (and I am sure that all of you know) that the Profile series used the 5.25" Winchester drives. I was expecting to find a standard Lacie, or Quantum drive in the SC, as they were commonly used with compacts that had the HD feature built-in. Nevertheless, this would explain why the SC20 is heavier than my now-deceased Jasmine Direct 80.
In regards to removing the HD, no I have not attempted that just yet, as I do not want to cause any potential damage to the unit, and I was curious to see what replies I would get on the 68k forum. A question though- the screws that are on the top case of the Seagate HD- are they there to remove the top cover of the drive itself, or to remove it from the housing of the SC20? I was thinking of removing the jumper cables as an attempt to loosen the HD, but it is tightly wedged near the SCSI connector ports.
Personally, I have never seen a 120 meg Apple SCSI drive. They probably didn't sell well, as most built-in HDs by that time could store over 80 megs of information, so the need for an external SCSI drive would not have been a great necessity to complete/store daily work projects.
Mac 128- I am indeed surprised that Apple used a 5.25" drive in the SC (not SE) series. I know for a fact (and I am sure that all of you know) that the Profile series used the 5.25" Winchester drives. I was expecting to find a standard Lacie, or Quantum drive in the SC, as they were commonly used with compacts that had the HD feature built-in. Nevertheless, this would explain why the SC20 is heavier than my now-deceased Jasmine Direct 80.
In regards to removing the HD, no I have not attempted that just yet, as I do not want to cause any potential damage to the unit, and I was curious to see what replies I would get on the 68k forum. A question though- the screws that are on the top case of the Seagate HD- are they there to remove the top cover of the drive itself, or to remove it from the housing of the SC20? I was thinking of removing the jumper cables as an attempt to loosen the HD, but it is tightly wedged near the SCSI connector ports.
Personally, I have never seen a 120 meg Apple SCSI drive. They probably didn't sell well, as most built-in HDs by that time could store over 80 megs of information, so the need for an external SCSI drive would not have been a great necessity to complete/store daily work projects.
If you unscrew those screws on the top cover of the drive you'll let the magic smoke out. Don't do it.
5.25 inch drives like that are secured in the same way as the more modern varieties, meaning it either has four screws run into the sides of it (about a half inch away from the bottom), or it's secured with screws going up from the baseplate into vertical holes in the bottom. I've never seen an SC20 enclosure in the flesh before, but I'd try flipping it over and seeing if there are four screw heads arranged in an outline around where the drive is. If that's not the case the enclosure may have a "false bottom" shelf the drive is sitting on, and you'll have to figure out how the Chinese puzzle goes together.
I'll just mention this "because", but... computer surplus places still often carry generic SCSI drive cases in both 3.5 and 5.25 inch sizes. (half-height 5.25 enclosures housing CD-ROM drives are particularly common. You can usually easily adapt those to hold a hard disk with a suitable adapter sled. You might also find cases with tape drives in them that will do.) You might want to leave your antique as it is and get a new enclosure for your modern drive.
As another aside, I have to say I'm impressed to see a working Seagate ST-225. The MFM version was dirt common in PCs... almost thirty years ago.
