On 2017-09-08 21:22, Wols Lists wrote:
On 08/09/17 19:53, Carlos E. R. wrote:
The more of those 10 msec delays, the longer the whole wipe takes.
I tend to do 10MB just so I don't have to think about the capacity of a single track. 10MB is plenty big to keep the disks write buffers full, but small enough not to impact the system RAM.
Noted, thanks :-)
Note also that CHS (cylinders, heads, sectors), which used to define track size, is now archaic and meaningless.
Yes, I know that.
Modern drives now use "constant angular velocity". Which may mean that declaring a drive as 5200rpm or 7000rpm is also a little meaningless :-)
I don't understand this. You mean they change rotational speed (rpm) based on some criteria?
Basically, the physical size of a sector is now constant. So a track near the centre of a disk may have a capacity of 1MB, say. Move further out, double the radius say, and you've doubled the physical length of the track if I remember my maths right. So this track now will store 2MB. Move out the same distance again and that track will store 3MB.
Ah, yes. -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" at Telcontar)