maximum of partitions in linux?

[sf433]

1. what is maximum numbers of below?

ide
scsi
partition in each hardware
total useable of partition

[budman7]

There can be a maximium of 4 primary partitions.
One of the Primary can be an extended.
Which can contain as many partitions as you desire. No limit, except for the size of te medium.
No difference between ide and scsi as far as number of partitions go.

Let me know if I didn't answer your question to your satisfaction.

[sf433]

+ Thanx

[jens]

There can be a maximium of 4 primary partitions.
One of the Primary can be an extended.
Which can contain as many partitions as you desire. No limit, except for the size of te medium.
No difference between ide and scsi as far as number of partitions go.

Let me know if I didn't answer your question to your satisfaction.

It's limited cause of the amount of partition devices the kernel can make and use.
Last time I checked:
IDE: Max 63 (4 primary/extended and 59 logical)
SCSI: Max 11 or 27

[borromini]

Do not take this as Windows bashing, but Windows can only make 26 partitions normally (letters of the alphabet). That would imply not using any floppy, cd-rom or other device.

[sf433]

I found from text book, It was printed a few years ago. I am not sure it is absolutly correct.
max of partittion for ide = 63
max of partition for scsi = 15

a) but I don't know how to calculate,
For each hd, let say hda, max of partition are

hda1-primary
hda2-primary
hda3-primary
hda4-extended
hda5-logical
hda6-logical
hda7-logical
hda8-logical

total: max 8 partitions per each hd
if max of hd is 8, it should be 8x8= 64 partitions, why there is only 63? where is the other one?

b) scsi is only 15 ? only 2 scsi(how could it be)? 2x8= 16 partitions? where is the other one?

c) It looks like a simple question, but I really want to get a right concept from basic again.
Thanx

[budman7]

I think you are getting the hard drives and partitions mixed up. 63 ide hard drives(that is a lot of controllers) and 15 scsi. I believe you can chain 127 usb devices together, making them all hard drives.
I personally have 10 partitions on my120 GB hard drive.
Off topic

Do not take this as Windows bashing, but Windows can only make 26 partitions normally (letters of the alphabet). That would imply not using any floppy, cd-rom or other device.

Actually Windows can only make 23 partitions. One primary and one extended that can have 22 logical
C: is primary
A: is dedicated to floppy
B: is dedicated to floppy(how stupid is that)
D: would be the extended that holds all the logical

[jens]

why there is only 63

Cause 63 is simply the the maximum amount of partition devices the kernel can make on an IDE drive and use. Their's no other reason (in Linux the firts 4 are reserved for primary/extended, leaving maximum 59 partitions as logical).

I think you are getting the hard drives and partitions mixed up

Euhm... no.

[budman7]

budman7 wrote:
I think you are getting the hard drives and partitions mixed up

Euhm... no. Confused

I was referring to

I found from text book, It was printed a few years ago. I am not sure it is absolutly correct.
max of partittion for ide = 63
max of partition for scsi = 15

a) but I don't know how to calculate,
For each hd, let say hda, max of partition are

hda1-primary
hda2-primary
hda3-primary
hda4-extended
hda5-logical
hda6-logical
hda7-logical
hda8-logical

total: max 8 partitions per each hd
if max of hd is 8, it should be 8x8= 64 partitions, why there is only 63? where is the other one?

b) scsi is only 15 ? only 2 scsi(how could it be)? 2x8= 16 partitions? where is the other one?

[jens]

Ah... I mist his last part and thought you meant the amount of partitions and drives... (it's indeed hda1till hda63)

PS: I highly doubt this could ever be very functional on current drives though...