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I want to upgrade the internal disks on an LC and a Performa 475, both of which have the &quot;pizza box&quot; case. &nbsp;I am told that I can only put 1/3 height drives (0.75 inch thick) in these machines, and that 1/2 height (1.0 inch thick) drives won't fit. &nbsp;Is this true?<br />
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On a related issue, I am not very knowledgeable about SCSI disks, so I want to make sure that what I buy will work in these machines. &nbsp;Are there any issues of absolute storage capacity to worry about (e.g in DOS-land, there is the infamous &quot;528 mb barrier&quot; for IDE drives without BIOS upgrades)? &nbsp;What is the implication of SCSI vs SCSI-2 vs SCSI-3 vs Wide SCSI vs Fast SCSI etc? &nbsp;Which one(s) will work in my machines and which one(s) won't? &nbsp;Why?<br />
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Thanks<br />
<br />
Justin Harlow
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I want to upgrade the internal disks on an LC and a Performa 475, both of which have the "pizza box" case.  I am told that I can only put 1/3 height drives (0.75 inch thick) in these machines, and that 1/2 height (1.0 inch thick) drives won't fit.  Is this true?

On a related issue, I am not very knowledgeable about SCSI disks, so I want to make sure that what I buy will work in these machines.  Are there any issues of absolute storage capacity to worry about (e.g in DOS-land, there is the infamous "528 mb barrier" for IDE drives without BIOS upgrades)?  What is the implication of SCSI vs SCSI-2 vs SCSI-3 vs Wide SCSI vs Fast SCSI etc?  Which one(s) will work in my machines and which one(s) won't?  Why?

Thanks

Justin Harlow

Disk upgrades for LC-class machines

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.