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
Samsung Galaxy Tab A8 10.5" SM-X200 128GB Wifi Only Tablet Open Box
$149.99
EXCELLENT SAMSUNG GALAXY TAB 4 10.1in SM-T537V 16GB WIFI VERIZON ANDROID TABLET
$37.99
Case for Samsung Galaxy Tab A9+ 5G/A9 Plus 11"/A9 8.7"Shockproof Stand Full Body
$17.99
Samsung USB 3.1 Flash Drive Bar Plus 256gb TITAN Gray
$24.10
Samsung Galaxy Tab A9 (X110) 64GB 4GB RAM International Version (New)
$129.99
Genuine Samsung Book Cover Keyboard for 14.6" Galaxy Tab S8 Ultra | S8 Ultra 5G
$89.99
Samsung Galaxy Tab E 8" 16GB Black SM-T377V (Verizon) Android Tablet IG1000
$30.35
Samsung Galaxy 12.4 Inch Slim Keyboard For S7+ | S7 FE | S8+ | S8+ 5G EF-DT730
$49.99
Tempered Glass Screen Protector For Samsung Galaxy Tab S9/S9 FE/S9 Plus/S9 Ultra
$10.95
Samsung XE310XBA-KC2US 11.6" HD Chromebook 4 Intel Celeron N4020 4GB 64GB
$111.99