#Cd rom for mac mac os#
#Cd rom for mac install#
#Cd rom for mac drivers#
#Cd rom for mac update#

Why this didnвЂ™t occur to me to try several years ago, when MicroMat would have been able to fix it, i donвЂ™t know for sure. Finally, i made a CD-R copy of my TTP CD-ROM, identical except for the one-byte change from F9 to FF: No Crashes when running under OS 7.6.1.

#Cd rom for mac install#

I did this several times with both a CD all-Macs OS install and an OS originally installed on the IIsi HD specific to the IIsi. I re-edited it to be F9 again: the crashes returned. I edited the crashing copy of 7.6.1 copied from the TTP CD-ROM so that the byte was FF: the crashes went away. There was 100% correspondence between the presence of F9 and Type 1 crashes, and FF and no crashes. I checked the 5 or 6 other OS 7.6.1 System files i currently had available on various Mac HDs and on the AlSoft DiskWarrior 2.1.1 CD-ROM: all of them had the byte FF at that same position. I checked the three MicroMat-made TTP CD-ROMs i have (for TTP 2.5.4, 3.0.6, and 3.0.9): every single one had the byte F9 at offset 2910 in the gpch ID=667 resource. Specifically, a one-byte difference in the вЂњgpchвЂќ resource between working and crashing versions of the file.

After many, many hours of thought and experimentation, i finally found the problem: a defect in the System file of OS 7.6.1 on the TechTool Pro CD-ROM. There were several false leads and dead ends.

Next, i spent literally a couple of days trying experiments comparing the working and crashing copies of OS 7.6.1, and shuffling parts between them to try and narrow down the root problem.

#Cd rom for mac mac os#

The problem was not related to the copy of TechTool Pro itself residing on the CD, and was instead a problem with the copy of the Mac OS 7.6.1 on the CD.The problem was not specific to something else on the CD.Sure enough, when running from the OS 7.6.1 copied from the TTP CD-ROM, Type 1 crashes happened all over the place, in the same way and under the same conditions as when booted from the CD. I knew that when running from the stock 7.6.1 on the HD, Type 1 crashes were extremely rare (if indeed they happened at allвЂ¦ i donвЂ™t remember). It occurred to me to try copying the OS 7.6.1 off the CD-ROM onto my IIsiвЂ™s internal hard drive (hereinafter HD), to see if the crashes would still happen. It sometimes seemed difficult to do anything running under 7.6.1. Running from OS 7.5.5 on the CD rarely crashed, and when it did, the crashes were usually not Type 1. I had long know that the problem only occurs when the computer is running from the Mac OS 7.6.1 on the CD.

#Cd rom for mac update#

Having become annoyed at this situation during March 2005 testing for an update to this review, i decided to take the time to look deeper into the problem.

Interface Type:USB3.SonicвЂ™s TechTool Pro CD-ROM Fix Type 1 Crash Fix History & The SituationДЄs discussed in the individual reviews for TechTool Pro versions 2 and 3, Type 1 crashes when booted from the TTP CD-ROM have been very frequent, esp.

Supported Disc: CD-ROM,CD-R,VCD-ROM,VCD-R,DVD-ROM,DVD-R.

Compatible Devices: All Laptops and Desktop Computers with Type-A or C USB interface.

And the brushed ABS plastic housing makes it stylish and durable.The original imported chip provides good performance and quality assurance. Slim and lightweight features it easy to carry.

#Cd rom for mac drivers#

It comes with a USB-C adapter, any laptop or desktop computer can use this CD-ROM drive.Plug and Play, no need to install drivers and no additional power supply. It can be used to watch movie, listen to music, install software and install operating system. The ECD819-SU3-R DVD-ROM is compatible with CD,VCD and DVD disc.