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Tag: hardware

Updates and changes to my ThinkPad T420i

While I haven't been doing much posting recently, I have been doing behind-the-scenes work on this website. The main thing was that I changed quite a few images from being hot-linked (when sites were okay with that) to being hosted; this was done after realizing some web filters were not blocking my website but were blocking a bunch of the images that were hosted off-site.

I've also made some substantive changes to my laptop: I am no longer dual-booting Scientific Linux and Windows 7, so no more posts about Linux and this computer. Instead, I am running Windows 7 on my laptop and running other operating systems in virtual machines inside of that (using VirtualBox). Most of the time I use Windows 7 as a guest (yes, on a Windows 7 host), but I do also use WatchOCR and Xubuntu. The reason why I virtualize Windows 7 on Windows 7 is so recovering from a catastrophic incident (e.g. computer stolen or destroyed) is quicker: just move the Windows 7 VM with all of my work on it to another computer and continue working.

Of course, simultaneously running 3 VMs is tough on a computer, so I upgraded to 16GiB of RAM. I specifically used 2x Centon 8GB DDR3-1333 (PC3-10666) 204-pin. The specific part number was R1333SO8192, pictured below. (RAM can be finicky, so I figure giving more details about what worked for me is better than too few. Also, the 8GB is what is on the package even though it should be 8GiB - I just don't want to be called out for inconsistency. </pedantic>)

I used two of these Centon sticks in my computer, and they seem to work great.
I used two of these Centon sticks in my computer, and they seem to work great.

I also replaced the hard drive with a Samsung 840 Pro 256GB SSD (MZ-7PD256BW). It works pretty well, and I utilize the whole disk encryption, though I don't really notice any benefits over my previous Intel SSD (other than increased capacity).

Of course, it's not all good news: with all of these changes to my computer, my battery life has taken a substantial hit. When it was new, I was comfortably getting 8 hours. Now, with battery capacity at 62% according to the ThinkVantage Toolbox, I'm getting about 2 hours. I'm not often away from a plug, but virtualizing OSes may not be such a great idea if you need long battery life. Or simplicity in many other ways - but my complex system works well for me.

(To help those using search engines, my ThinkPad T420i is model number 4177-CTO.)

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My ThinkPad specs

One of the primary focuses of this blog is going to be the technology (software/hardware/devices/etc.) that I use to be productive. The first few posts I assume will relate to software on my laptop (and fixing issues). Now, because laptop configurations vary considerably, I'm going to post everything I can about my computer so that if others experience similar issues there is a greater likelihood of finding the solution. I have more than one computer, so posts that are primarily concerned with this computer will be tagged with "ThinkPad T420i".

Lenovo ThinkPad T420i Hardware (Model 4177-CTO)

  • Processor: Intel Core i5-2430M processor (dual-core, 2.40GHz, 3MB Cache)
  • Memory: 8GB PC3-10600 1333MHz DDR3, non-parity,¬†dual-channel capable (two 204-pin SO-DIMM sockets) (It may be possible to upgrade this to 16GB based on some things I've read (sources later), but it is currently listed as 8GB as the maximum memory.)
  • Chipset: Mobile Intel QM67 Express Chipset
  • Screen: 14" screen supporting 1600x900 resolution
  • Graphics: Intel HD Graphics 3000 (integrated)
  • Wireless: 1x1¬†11b/g/n, Wireless LAN PCI Express Half Mini Card, Intel Centrino Wireless-N 1000

Lenovo ThinkPad T420i Software

  • Microsoft Windows 7 Professional (64-bit)
  • Scientific Linux 6.2 (64-bit) (SL is a Red Hat Enterprise Linux clone)

I'm currently trying to switch to Scientific Linux as my primary operating system, so there will certainly be some posts about overcoming issues I've experienced with this (slow) transition. I'll keep this list updated with changes or additional information (or corrections) as I find them.

Below are a few documents I've found on the Lenovo support website which list detailed information about this computer (and related ones). I've posted them here because locating them wasn't obvious on the Lenovo website and, as products age and are no longer supported, the supporting documentation has a habit of disappearing.

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