Re: BIOS Can Not Find Disk
On 12/04/17 07:21, David Wright wrote:
I recently reformatted a disk thus:
puck: GPT-style, master
Part # filesys size code rôle
puck - 1007KiB partition tables and alignment space
puck01 - 3MiB EF02 bios-boot for Grub (bios_grub flag)
puck02 FAT32 496MiB EF00 EFI (boot flag)
puck03 ext2 500MiB 8300 /boot (unencrypted)
…
Your console session is incomplete -- you did not copy/paste your command.
which gdisk shows as
Number Start (sector) End (sector) Size Code Name
1 2048 8191 3.0 MiB EF02 BIOS boot partition
2 8192 1023999 496.0 MiB EF00 EFI System
3 1024000 2047999 500.0 MiB 8300 Linux filesystem
…
As above; but at least you dropped a clue, "gdisk".
Here is some more info:
# gpart -d -vvv /dev/sda
dev(/dev/sda) mss(512) chs(1946/255/63)(LBA) #s(31277232) size(15272mb)
Primary partition(1)
type: 238(0xEE)(UNKNOWN)
size: 15272mb #s(31277231) s(1-31277231)
chs: (0/0/1)-(1023/254/63)d (0/0/2)-(1946/233/63)r
hex: 00 00 01 00 EE FE FF FF 01 00 00 00 AF 40 DD 01
Primary partition(2)
type: 000(0x00)(unused)
size: 0mb #s(0) s(0-0)
chs: (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r
hex: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Primary partition(3)
type: 000(0x00)(unused)
size: 0mb #s(0) s(0-0)
chs: (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r
hex: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Primary partition(4)
type: 000(0x00)(unused)
size: 0mb #s(0) s(0-0)
chs: (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r
hex: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
dev(/dev/sda) master boot record (w/o partition table):
0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
00A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
00B0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
00C0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
00D0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
00E0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
00F0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0130: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0140: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0170: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
0190: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
01A0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
. . . . . . . . . . . . . . . .
# gdisk -l /dev/sda
GPT fdisk (gdisk) version 1.0.1
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: present
Found valid GPT with protective MBR; using GPT.
Disk /dev/sda: 31277232 sectors, 14.9 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): C078C1DF-29A5-4552-917D-995FF9946D9F
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 31277198
Partitions will be aligned on 2048-sector boundaries
Total free space is 19560557 sectors (9.3 GiB)
Number Start (sector) End (sector) Size Code Name
1 2048 1953791 953.0 MiB EF00 ESP
2 1953792 11718655 4.7 GiB 8E00 stretch
# fdisk -l /dev/sda
Disk /dev/sda: 14.9 GiB, 16013942784 bytes, 31277232 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: C078C1DF-29A5-4552-917D-995FF9946D9F
Device Start End Sectors Size Type
/dev/sda1 2048 1953791 1951744 953M EFI System
/dev/sda2 1953792 11718655 9764864 4.7G Linux LVM
Is the absence of a partition like puck01 on your disk a significant
factor in your failure to install grub?
ie where's grub going to place itself?
I initially let d-i/partman automagically partition the SSD, looked at
the table it generated, and saw a ESP partition, a swap partition, and a
root partition. I then wipe the first and last megabyte, created the
GPT partition with parted, and then proceeded with the complex disk
layout I really wanted. Unfortunately, debian-9.1.0-amd64-xfce-CD-1 d-i
blew up trying to install GRUB, so I don't know where GRUB ends up when
UEFI firmware and GPT partitioning is done correctly. That's why I plan
to try again with the simplest automagic partitioning and see what happens.
STFW I found another useful article:
http://www.rodsbooks.com/efi-bootloaders/grub2.html
David
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