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
IBM Power8 S822L Storage Server 8247-22L - With Ram, Some Cards, No HDD's
$399.95
IBM SYSTEM X3500 M3 SERVER 7380AC1 2*XEON E5620 2.4GHz 8GB SEE NOTES
$33.21
IBM x3650 M4 2x Xeon E5-2670 2.6ghz 16-Core / 64GB / M5110e / 2x PSU
$129.99
IBM X3650 M5 5462-AC1,2 X E5-2640V3 2.6GHZ 8C, 16 GB, DUAL 750W, 2 X 1TB SERVER
$249.99
IBM 8284-22A S822 Dual Power8 Cpu 512Gb (16x 32Gb) RAM
$795.00
IBM Lenovo X3650 M5 2U 8x 2.5” CTO Rack Server – 2x HS, 2x 750W
$199.00
IBM Power S822 12-Bay Server System Power8 Core 3.42Ghz DVD-Rom Drive 64GB No HD
$399.99
Dell PowerEdge R730xd 24B SFF 2U Xean E5-2690 V4 2.6 ghz 28-cores 4x 1.2 TB
$500.00
IBM 8203 E4A p520 Server 8203-E4A 4.2GHz 2-Core POWER6 32GB RAM / NO HDD USED
$119.99
IBM Power S822 8284-22A 12SFF Power8 3.89GHz 6-Core 64GB RAM No Bezel/HDD Server
$359.99