On the first screen of the installer click Next and then accept the EULA. Once it has the installer will launch automatically. Once that is done wait for the MacOS High Sierra download to complete.
Give it any name you wish and make sure the format is Mac OS Extended (Journaled) and the Scheme is set to GUID Partition Map. When selecting your external storage make sure you select the top level item (in my example below this is JetFlash Transc… rather than Transcent below it) and click Erase. In the View menu make sure Show All Devices is selected. While that is downloading plug in your external drive and open Disk Utility. Start by opening the App Store and searching for MacOS High Sierra and proceeding to download it.
The first part of this guide is to install MacOS onto an external drive. I would also like to thank Miguel from the comments section of Part 1 for the inspiration for Part 2. I also recommend reading Part 1 to familiarise yourself with the process that will be followed here, though it is not identical it is similar. I highly recommend making a backup of your system before starting (assuming your hard drive isn’t so far gone you can’t do that). The faster this storage, the better! USB 3.1 (and USB C) and Thunderbolt drives will work best.Īs with Part 1 this guide is aimed at more advanced users. This is because you will be installing MacOS onto an external drive and booting your Mac from it. In order to proceed with this you will need an external hard drive or USB drive with at least 20 GB of space available on it. So much for removing the drive so that you can run SpinRite on another computer! This post will guide you through the process of running SpinRite on your Mac’s internal storage using your Mac! However, what if you want to run SpinRite on your Mac’s internal drive? If you’re running a fairly modern Mac your storage will be soldered to the motherboard making it impossible to remove. The first part of this guide focused on running SpinRite on your Mac to scan an external drive.
According an old Microsoft KB article ( KB126855) I found "SpeedStor from Storage Dimensions, EZ-Drive from Micro House, and Disk Manager from OnTrack Computer Systems" are possibilities.
If you're not booting off the hard drive then I think there were drivers for MS-DOS that performed CHS translation.
You should check to see if your BIOS has some sort of "large" drive support you can enable. Apparently though your BIOS doesn't support this, otherwise the drive probably would've worked. To get around the 504 MiB limit many BIOSes supported CHS translation, where they converted BIOS CHS addresses to IDE CHS addresses using some sort of transformation. Taking the minima of these three pairs (1024 × 16 × 63) gives you the 504 MiB limit. The BIOS supports addressing up to 1024 cylinders, 256 heads and 63 sectors, while IDE supports up to 65536 cylinders, 16 heads and 255 sectors. The limit you've encountered is due to the intersection of the BIOS and IDE limits on CHS addressing being much less than either individually. (A bug in MS-DOS means that it crashes if a drive has 256 heads, so its limit is a bit smaller than the BIOS limit but still almost 8GB.) The CHS BIOS interfaces MS-DOS uses for disk access support drives up to just under 8 GiB, so this also about the limit for MS-DOS. MS-DOS 6.22 only uses CHS (cylinder/head/sector) addressing to access disks, so it doesn't really matter if the BIOS supports LBA addressing.