09-21-2012
Quote:
Originally Posted by
fpmurphy
MBR partitions can be greater than 2Gb. GPT is required when your disk is greater than approx 2Tb and using 512 sector sizes.
Of course, it was a typo: I meant 2TB.
In MBR every partition is defined by its starting sector and its size in sectors. Both values are limited to 32 bits. So a partition max size, as well as its farthest possible starting point, is:
(2^32-1) x 512 = 2,199,023,255,040 bytes.
This means that you can use a MBR for two 1.5TB partitions in a 3TB disk, for instance. On the same disk you can't use MBR for a single 3TB partition, nor for four 750GB partitions, nor for two partitions of 0.5TB and 2.5TB ...
Today even disks having 4kB sectors show to the system virtual sectors of 512B. So the disk sector real size doesn't affect the 2TB limit.
--
Bye
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LEARN ABOUT OPENSOLARIS
sda
sda(7D) Devices sda(7D)
NAME
sda - SD/MMC architecture
DESCRIPTION
The sda module provides support services for Secure Digital (SD) and MultiMediaCard (MMC) slot and card device drivers.
FILES
/kernel/misc/sda 32-bit ELF kernel module (x86).
/kernel/misc/amd64/sda 64-bit ELF kernel module (x86).
/kernel/misc/sparcv9/sda 64-bit ELF kernel module (SPARC).
ATTRIBUTES
See attributes(5) for a description of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Architecture |SPARC, x86 |
+-----------------------------+-----------------------------+
|Availability |SUNWsdcard |
+-----------------------------+-----------------------------+
SEE ALSO
cfgadm_sdcard(1M), attributes(5), blk2scsa(7D), sd(7D), sdcard(7D), sdhost(7D), scsa2usb(7D), wbsd(7D)
System Administration Guide, Volume I
System Administration Guide: Basic Administration
NOTES
The sda module provides support only for SD/MMC devices that are connected via a supported slot driver. Notably, slots that are on USB
busses are normally treated as USB mass storage devices and are serviced by the scsa2usb(7D) driver.
SunOS 5.11 8 Jan 2009 sda(7D)