DrHu wrote:I think Primary partitions are good for completely separating OS(s) from each other, if you use extended/logical partitions you tie your alternate OS into the health of the OS that created the extended partitions..
That's not really true, although there is a hint of something true that's remotely similar: Logical partitions are defined in a linked-list data structure, which means that the definition of the first logical partition includes a pointer to the next one, which in turn includes a pointer to the third, and so on to the end of the list. Thus, if an early logical partition's data structure is damaged, that will disrupt access to subsequent logical partitions in the list. Such damage is pretty rare, but it does occur from time to time. Note that this is damage to the partitions,
not to the OSs, filesystems, or data
those partitions. So if you have (say) Ubuntu on /dev/sda5 (the first logical partition) and Mint on /dev/sda7 (the third logical partition), and if your Ubuntu installation is damaged without actually damaging the logical partition data structure, you'll still have no problem using Mint. Most damaged OS installations do not
involve damage to partition data structures.
Also I tend to think that even with the option of having 128 slices available(partitions), I would prefer to have fewer, even with fairly larger hard drives: for example 4TB or increasing in the future ?
--too much data or data names (hard drive areas: slices/partitions) is too much information overload
Just because you can
create up to 128 partitions doesn't mean you have to.
Here's the partition table on one of my GPT disks:
- Code: Select all
$ sudo gdisk -l /dev/sdb
GPT fdisk (gdisk) version 0.8.5
Partition table scan:
BSD: not present
APM: not present
Found valid GPT with protective MBR; using GPT.
Disk /dev/sdb: 625142448 sectors, 298.1 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): B58D5E92-7BFB-4488-94B9-2F1BCFDD86DB
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 625142414
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)
Number Start (sector) End (sector) Size Code Name
1 2048 514047 250.0 MiB EF00 Unused ESP
2 514048 923647 200.0 MiB 8300 /boot
3 923648 625142414 297.7 GiB 8E00 Linux LVM
Note the line that specifies that the partition table holds up to 128 entries -- it's a normal-sized GPT. Yet only three partitions are defined, and gdisk displays information on just those three partitions. If I were to use parted or GParted, the results would be similar -- they'd show just the three defined partitions and nothing more. It's kind of like having a 4TB disk with 200MB of data on it -- most of the disk is available for use should you need it, but there's no compulsion to use it. There's no extra cost to having space for 128 partitions, though, unlike a big hard disk, for which you presumably paid more money than you'd have paid for a smaller one.
skos wrote:The reason i ask for the number of primary partitions is that i suspect the i have a problem with one of my partitions.
The thing is that i already have total of 4 primary partitions on my hard disks and some extended.
I tried to mount a primary partition ext4 that for a reason i dont remeber never used and since then i cannot (the OS) automount all the other primary partitions.
What sort of a problem? It's usually better to fix a problem rather than just throw more resources (e.g., more hard disks) at the computer in an effort to bypass the problem. In the latter case, the problem will still exist, and some types of problems will create bigger problems if left unattended. For instance, if you're having problems with bad sectors on the hard disk, that could be a sign that the disk is failing, and such problems can grow to affect additional partitions. In this case, replacing the hard disk is in order. That's just one example, though, and I'm not suggesting it applies to you -- I don't have sufficient evidence to know. Posting the information that altair4 requested, along with a description of whatever symptoms you're seeing, will help us give you better advice.