Re: udev causing data loss?
- From: Nate Bargmann <n0nb@xxxxxxx>
- Date: Sat, 15 Nov 2008 07:05:23 -0600
* Boyd Stephen Smith Jr. <bss03@xxxxxxxxxxxxxx> [2008 Nov 14 20:40 -0600]:
On Friday 14 November 2008, ghe <ghe@xxxxxxxxxxx> wrote about 'Re: udev
causing data loss?':
Florian Kulzer wrote:
The names of internal disks change without notice. This, IMHO, is an
extremely lame idea. I know better now, but it was an expensive lesson.
That could happen with devfs, or static device nodes, too. I suppose it
was rarer, but then device scanning was non-asynchronous then. Udev
finally gives us a way to attach a name to the device vs. depending on
quirks of the device scanning code to stay the same.
Udev didn't cause the data loss. fdisk did!
If one wasn't careful, such a data loss could happen in the DOS days
(not sure about Win32). IIRC, consider a drive formatted as two
partitions, C: and D: where C: is a primary partition and D: was an
extended DOS (logical) partition. Add a new hard drive to the mix and
fdisk it for two partitions. One could be forgiven for thinking the
original drive would remain C: and D: and the new drive might be E: and
F:, however, one would be wrong.
Assuming IDE drives on the same cable (Master/Slave), the primary
partition of the Master was C:, as expected, the primary of the Slave
was D:, the extended partition of the Master was E: and the extended
partition of the Slave was F:. In short, the system would assign all
the primary partitions drive letters in physical order and then all of
the extended partitions on the first drive followed by all the extended
partitions on the second drive and so on. That required some
explanation when a larger drive was added to a system prior to
FAT32/NTFS.
I thought I'd forgotten that arcane knowledge/experience.
- Nate >>
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