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Actually there shouldn't be a problem with MaxTransfer. The device driver should know the hardware limitations and automatically split large packets into smaller ones. Just like ping and MTU in TCP/IP world.
But scsi.device does not do this. If you specify a MaxTransfer value larger than 0x1fe00, it will send a mangled command to the device, resulting in corrupted data. So it is important to set MaxTransfer to a reasonable value when using scsi.device.
However, it also depends on the version of scsi.device which is used. For example when using IDEfix, a new scsi.device is used which does automatically split large packets. So with IDEfix MaxTransfer should not be an issue.
Finally MaxTransfer issues only arise when using files larger than the critical limit. Files smaller than 127.5K are not affected at all. Similarly large files might not be affected if a copy program is used which does not attempt to write more than 127.5K at a time.
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