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Solved HD has support

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R

rebom

PCHF Member
Mar 11, 2022
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#1
hi, i would like to know if a hd has support for LBA48 what does it mean?
as in the image in the text at the top right
Thank you
Photo1.png
 
#2
The information in the image you suppled is not a hard drive it is a compact flash driver.

What is the issue that you are having with the flash drive?

www.linuxquestions.org

What exactly is LBA48?

What is LBA48 ? I have a western digital 200GB IDE hard drive (WD2000JB) and I can only partition about 137GB. After playing around for a while I
www.linuxquestions.org www.linuxquestions.org

48-bit Logical Block Addressing (LBA) extends the capacity of IDE ATA/ATAPI devices beyond the limit of 137.4 GB. This limit applies to IDE ATA/ATAPI devices only and not to SCSI interface devices. The original design specification for the ATA interface only provided 28-bits with which to address the devices. This meant that a hard disk could only have a maximum of 268,435,456 sectors of 512 bytes of data thus limiting the ATA interface to a maximum of 137.4 gigabytes. With 48-bit addressing the limit is 144 petabytes (144,000,000 gigabytes).

The kernel, motherboard BIOS and the IDE controller needs to support LBA48. AFAIK the 2.6 kernel shouldn't have a problem with LBA48.
Click to expand...
 
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#3
yes maybe English is not my strong point, but I understand that it speaks of hd higher than 137, but what does compact flash have to do with lba in question?
 
#7
Basically, it is just the way the system counts the sectors for storage devices.

see if this put it into perspective
en.wikipedia.org

CompactFlash - Wikipedia

en.wikipedia.org en.wikipedia.org
CompactFlash IDE mode defines an interface that is smaller than, but electrically identical to, the ATA interface. The CF device contains an ATA controller and appears to the host device as if it were a hard disk. CF devices operate at 3.3 volts or 5 volts and can be swapped from system to system. CompactFlash supports C-H-S and 28-bit logical block addressing (CF 5.0 introduced support for LBA-48). CF cards with flash memory are able to cope with extremely rapid changes in temperature. Industrial versions of flash memory cards can operate at a range of −45 °C to +85 °C.
 
#8
I have read everything but I did not understand if this cf card says that it has lba48 support, understood as being recognized as an lba48 or not? (hd higher than 137 gb)
 
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