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
12TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal NAS Hard Drive - 0753F0
$139.95
Seagate IronWolf NAS 12TB 7200RPM 256MB Cache SATA 6.0Gb/s 3.5" Hard Drive HDD
$132.99
Certified Refurbished 2TB WD Elements Portable Hard Drive - RWDBU6Y0020BBK-WESN
$49.99
Certified Refurbished 5TB WD Elements Portable Hard Drive - RWDBU6Y0050BBK-WESN
$89.99
HGST Ultrastar HUH728080ALE604 (0F23668) 8TB 7200RPM SATA 6Gb/s 3.5" Hard Drive
$87.99
Western Digital 2TB 3.5" HDD 7200RPM SATA III Hard Drive WD2002FYPS
$21.98
Seagate IronWolf 12TB 7200RPM SATA 6Gb/s 256MB 3.5" NAS Hard Drive ST12000VN0007
$134.99
WD HGST Ultrastar HC520 12TB 7.2K RPM SATA 3.5" HDD HUH721212ALE601 0F29596
$118.88
NEW Dell T2YHT 0T2YHT 12TB 7.2K 6Gb/s SATA 3.5" Hard Drive HUH721212ALE600 0 HRS
$139.99
HGST Ultrastar He10 10TB HDD 6GB/s SATA 7200 RPM 3.5" 4KN HUH721010ALN600
$119.99