# Weird Linux Question - Where's My Second Hard Drive?

**URL:** <https://boards.straightdope.com/t/weird-linux-question-wheres-my-second-hard-drive/568014>\
**Category:** Factual Questions\
**Created:** [January 17, 2011, 11:39pm UTC](https://boards.straightdope.com/t/weird-linux-question-wheres-my-second-hard-drive/568014 "2011-01-17T23:39:33Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![BigT](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bigt/32/12044_2.png) [@BigT](https://boards.straightdope.com/u/BigT)\
**Post date:** [January 20, 2011, 3:47pm UTC](https://boards.straightdope.com/t/weird-linux-question-wheres-my-second-hard-drive/568014/21 "2011-01-20T15:47:49Z")

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> [@ushimitsudoki](#):
>
> [http://www.linuxdocs.org/HOWTOs/SCSI-2.4-HOWTO/sr.html](http://www.linuxdocs.org/HOWTOs/SCSI-2.4-HOWTO/sr.html)
> 
> sr is the device driver.  
> 0 is the 1st device.

Yes, but it’s also part of the same consolidation I mentioned earlier. sr? was the SCSI CD-ROM interface. Now it covers all CD-ROM-like devices.

I’m not sure what it stands for, but, if I had to guess, I’d say **S** CSI **R** OM, since all the devices it took were basically some type of Read Only Memory.

If you didn’t guess, hd stands for **h** ard **d** rive, while sd stands for **S** CSI **d** rive. While it would make more sense to consolidate under hd if they’d done it all at once, as indicated by **Fubaya** , it took them a while for the new SATA/PATA (sd) driver to be good enough to completely remove the old IDE (hd) driver.

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