Strange. On Win7 this doesn't work:

    il@mar2 /cygdrive/c/Windows/System32
    $ cat /proc/partitions
    major minor  #blocks  name   win-mounts
    
        8     0         0 sda
        8    16         0 sdb
    
    il@mar2 /cygdrive/c/Windows/System32
    $ dd of=/dev/null if=/dev/sda bs=1M count=100
    100+0 records in
    100+0 records out
    104857600 bytes (105 MB, 100 MiB) copied, 0.215181 s, 487 MB/s


On 28.11.2020 20:04, Brian Inglis wrote:
> $ cat /proc/partitions
> major minor  #blocks  name   win-mounts
> 
>     8     0 976762584 sda
>     8     1     16384 sda1
>     8     2 976744448 sda2   C:\
>     8    16 976762584 sdb
>     8    17    131072 sdb1
>     8    18    102400 sdb2
>     8    19 975482161 sdb3   D:\
>     8    20    577536 sdb4
>     8    21    465920 sdb5
>     8    32         0 sdc
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