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- # MH-USB Internals
-
- ## MH-USB Performance
-
- ### USB2 Version
-
- From <https://www.blackmoreops.com/2017/04/04/usb-and-ssd-drive-speedtest-in-linux/>
-
- > USB 2.0 has a theoretical maximum signaling rate of 480 Mbits/s or 60
- > Mbytes/s. However due to various constraints the maximum throughput is
- > restricted to around 280 Mbit/s or 35 Mbytes/s.
-
- #### `hdparm` tests
-
- ``` console
- $ sudo hdparm -Ttv /dev/sde1
- /dev/sde1:
- multcount = 0 (off)
- readonly = 0 (off)
- readahead = 256 (on)
- geometry = 15600/64/32, sectors = 31881176, start = 2048
- Timing cached reads: 16422 MB in 2.00 seconds = 8221.42 MB/sec
- Timing buffered disk reads: 64 MB in 3.01 seconds = 21.28 MB/sec
- ```
-
- #### `dd` write test
-
- ``` console
- $ dd if=/dev/zero of=perf oflag=direct bs=128k count=8k
- 8192+0 records in
- 8192+0 records out
- 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 6.94198 s, 155 MB/s
- ```
-
- #### `dd` read test
-
- ``` console
- ## Clear the memory cache before benchmarking reads
- $ sudo sh -c "sync && echo 3 > /proc/sys/vm/drop_caches"
- $ dd if=perf of=/dev/null bs=4k
- 262144+0 records in
- 262144+0 records out
- 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 44.5847 s, 24.1 MB/s
- ```
- ### USB3 Version
-
- *Coming soon!*
-
- ## The MH-USB partition layout
-
- ### The Ventoy partion layout
-
- *Document how Ventoy creates partitions for both GPT and MBR partition tables*
-
- ### The 16 GB model
-
- *Standard ventoy partitions*
-
- ### The 32 GB model
-
- *Coming soon! (special partitions to accommodate haiku.)*
-
- ## Using the MH-USB Source Code
-
- ### Overview of the source code
-
- ### The scripts
-
- #### `download-images.sh`
-
- #### `prepare-usb.sh`
-
- #### `qemu-*.sh`
-
- ### Installing MH-USB
-
- ### Customising the MH-USB
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