Dear All -
If I use the command fdisk -l I get the usual and expected output of the style
Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 131604479 131602432 62.8G 7 HPFS/NTFS/exFAT
/dev/sda2 131604480 1180327679 1048723200 500.1G 7 HPFS/NTFS/exFAT
/dev/sda3 1180327680 2229050879 1048723200 500.1G 7 HPFS/NTFS/exFAT
My question concerns the line
/dev/sda1 * 2048 131604479 131602432 62.8G 7 HPFS/NTFS/exFAT
Surely that means that /dev/sda1 starts at sector number 2048 and that there are 2,048 sectors at the start of /dev/sda (yes, numbered 0000-2047) allocated otherwise?
For various reasons I want to zero these initial sectors of /dev/sda using the command
dd if=/dev/zero of=/dev/sda count=2048
but to my annoyance (and very considerable damage to the system) this also zeroes the first sector of /dev/sda1.
That is, the dd command zeroes not just those sectors numbered 0000-2047 but also the sector numbered 2048: so 2049 altogether. not 2048.
I am absolutely convinced that my understanding of counts / numbers / numbering as described above was correct under 7.4.2 and that I issued commands, many times, in the manner describe without damaging /dev/sda1; (but I am a bit nervous now about checking that)!
Can anybody conform that I am right? That I am wrong? That dd under 8.2.0 is glitchy?
Thank you!
Fergus
PS And by the way (completely different and unconnected) I find the file /boot/isolinux/ifcpu64.c32 is broken in the 8.2.0 installation and I have to over-write it with the same file from 7.4.2 for things to work properly. Anybody else?
Fergus
ALLEN BRADLEY 281G-F12S-10B-RRG-CBG /C AMORSTART MODULE 280G-FS-10-RG STK 2911
$380.00
Intel - Core i7-12700K Desktop Processor 12 (8P+4E) Cores up to 5.0 GHz Unloc...
$419.99
Intel - Core i9-12900K Desktop Processor 16 (8P+8E) Cores up to 5.2 GHz Unloc...
$619.99
Intel Xeon E5-2697A V4 2.6GHz CPU Processor 16-Core Socket LGA2011 SR2K1
$39.99
Intel Core i5-12600KF Desktop Processor 10 (6P+4E) Cores up to 4.9 GHz Unlocked.
$139.59
Intel Core i9-13900KF Unlocked Desktop Processor - 24 Cores (8P+16E) & 32 Thread
$539.99
Intel Quad Core i3-12100 3.3GHz 12MB LGA1700 12th Gen. CPU Processor SRL62
$45.93
AMD Ryzen 5 4500 6-Core 3.6GHz Socket AM4 65W CPU Desktop Processor
$79.00
Intel 16 Core i7-13700T DESKTOP processor TURBO Boost 4.90Ghz CM8071504820903
$269.00
Intel Core i7-13700K 3.40GHz 16-Core CPU LGA1700 BX8071513700K
$339.99