Solved

Read Native Max LBA using C#

Posted on 2009-05-14
2
696 Views
Last Modified: 2012-05-07
I'm trying to figure out how to read in the native max LBA using C#.  For example, if someone changes the max LBA of a drive, I want to be able to read the original max LBA set by the manufacturer of the drive.  Can anybody help me with this, or point me in the right direction?

Thanks in advance!
0
Comment
Question by:dev117
  • 2
2 Comments
 
LVL 39

Expert Comment

by:abel
ID: 24449421
there are basically two kinds of LBA: 28 bit and 48 bit. Whether a drive supports either of those, depends on the drive's driver and sometimes BIOS settings. In older windows versions, the ATAPI driver had a setting for either of those, and it needs to be enabled to allow large LBA. Info on how to check and how to change that is here: http://support.microsoft.com/kb/303013

In the event you mean what the largest LBA number is that a drive allows, you can do a little calculation based on the absolute size of the drive. The sector size is usually 512 bytes on modern windows systems (you can check to be sure). The maximum LBA sector number is then essentially equal to the absolute size divided by 512.

In the event you mean to find what the maximum size can be of a drive when 28-bit or 48-bit LBA is on, it is simple. 28-bit can do 2^28 * 512 = 137,438,953,472, or 128 GB. 48-bit LBA can do 2^48 * 512 = 144,115,188,075,855,872 or 134,217,728 GB or 128 PB (petabytes).

-- Abel --
0
 
LVL 39

Accepted Solution

by:
abel earned 500 total points
ID: 24449467
In addition, this may be of help to get the real size of a physical drive (the middle section in my post) which was also used to get the LBA size. It is in VB6 code, if you need help translating it to C# let me know: http://www.experts-exchange.com/Programming/Languages/Visual_Basic/Q_22825938.html
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Article by: Ivo
C# And Nullable Types Since 2.0 C# has Nullable(T) Generic Structure. The idea behind is to allow value type objects to have null values just like reference types have. This concerns scenarios where not all data sources have values (like a databa…
We all know that functional code is the leg that any good program stands on when it comes right down to it, however, if your program lacks a good user interface your product may not have the appeal needed to keep your customers happy. This issue can…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.
This video explains how to create simple products associated to Magento configurable product and offers fast way of their generation with Store Manager for Magento tool.

932 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now