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Author Topic: Is there any way to use a BLU disk image of a Widget drive with an emulator?  (Read 48006 times)

patrick

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Re: Is there any way to use a BLU disk image of a Widget drive with an emulator?
« Reply #15 on: July 09, 2020, 10:58:51 am »
The first Mac SCSI drives (HD20SC) still had 532 bytes blocks. Later they changed to the common 512 byte block size.

And there was the HD20 without SC which started as a Widget with Smartport controller. The Widget mechanism got replaced by Nisha, the second drive generation developed at Apple. Nisha proved to be even more unreliable than Widget, therefore it got replaced by an off-the-shelf Rodime drive with custom (Widget-compatible) analog board. And 532 bytes per sector.


From the drive's point of view all these 532 bytes are created equal. There is no difference between tags and data. This is just a data structure used by the operating system.
« Last Edit: July 09, 2020, 11:00:48 am by patrick »
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