The ramdisk is a block device, but you are trying to treat it like a
character device.
> If I cp /etc/fstab /dev/ram1, I get an I/O error, and when I cat /dev/ram1
> to see if anything made it in, it turns out that only the first 1024 bytes
> make it, and then I get a second I/O error on the read.
That's because it wants blocks of data, not bytes.
The useful way to use a ramdisk is to treat it like a disk device (a
small one), and create a filesystem on it. newfs /dev/ram1, mount it,
etc.
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