Moving usage to wiki

Usage.md

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+## Usage
+
+Hard Disk image files are placed in the root directory of a `ExFat` or `FAT32` formatted SD card. [`ExFat` is much faster](https://twitter.com/theory_retro/status/1376571371694723076). Use a premade or blank disk below. 
+
+Note: BlueSCSI images are compatible with the [RaSCSI](https://rascsi.com) and Basilisk II emulator.
+
+The naming convention is as follows (file name max 32 characters). Note you may mount multiple drives at a time to different SCSI ID's.
+
+`HDxy_512.hda`
+```
+HD - Hard Disk
+x - SCSI ID to attach to. 0-7 (though 7 on a Macintosh is the System)
+y - LUN ID - Set to 0 if unsure.
+512 - Sector size. Set to 512 if unsure. 256, 512, & 1024 supported.
+```
+
+### Video Tutorials
+
+If you'd like a video walk through of these steps here are a few:
+
+* [SD Card Prep](https://youtu.be/WuXM1oGt8cE)
+* [Create your own MacOS image](https://youtu.be/2O-2HR9pJlI)
+
+
+### Examples
+
+`HD10_512.hda` - Hard Disk at SCSI ID 1, LUN 0, sector size of 512.
+
+`HD51_512 System 6.0.8L LC.hda` - Hard Disk at SCSI ID 5, LUN 1, sector size of 512. Text between block size and .hda is ignored.
+
+#### Bad 
+
+`HD99_712 foo bar fizz buzz bang.hda` Over 32 chars and invalid SCSI/LUN/Block size
+
+If no image files are found PC13 will pulse on and off. Check the LOG.txt on the root of the SD card for any errors.
+
+### Premade Images
+
+Premade images are handy to just drop onto your SD card and go. You can use an emulator such as (Basilisk II)[https://www.emaculation.com/doku.php/basiliskii_osx_setup] on your modern machine to get software from places like the [Macintosh Garden](https://macintoshgarden.com) to your vintage mac.
+
+* Premade for RaSCSI work on BlueSCSI too - Rename the files based on the Usage instructions above. - http://macintoshgarden.org/apps/rascsi-68kmla-edition
+
+### Blanks
+
+These are blank, formatted drives. If you want to install an OS or software on an empty drive, use one of these.
+
+* Preformatted HFS blank images in various sizes - https://github.com/erichelgeson/BlueSCSI/tree/main/docs/MacHD.zip
+ - Unzip and rename to use.
+
+### Custom Disk Images (Advanced)
+
+This technique is useful when you would like a disk image larger than the pre-built images in the previous section.
+
+The following instructions demonstrates the process using https://ss64.com/osx/dd.html[dd] on a modern Mac:
+
+1. Open terminal.
+2. The following command will create a blank disk image. You can modify the command to suit your use.
+   * `dd if=/dev/zero of=example.hda bs=1m count=500`
+   * The `count` field defines the number of megabytes (`bs=1m`) the total disk image should be.
+   * The output file from the command is "example.hda". This can be changed in the `of=example.hda` field.
+3. Place the new blank disk image in the root directory of your SD card.
+4. If you do not already have a tool to format SCSI drives, [download LIDO](https://macintoshgarden.org/apps/lido-756). You can use an emulator such as [Basilisk II](https://www.emaculation.com/doku.php/basiliskii_osx_setup) to move files to the image to prepare your installation.
+5. After booting into your target machine with the working Mac OS disk image on your BlueSCSI from step 3, format the blank disk.