My father wants to sell his pc.  Before he does this he wants to delete personal data.  What is the best way to do this without a windows cd? He has a windows cd but it is scratched and does not work.
I am about to sell my old desktop PC and I am cautious about some of my sensitive information being available to the purchaser, even after reformatting the hard-drive, using data recovery software.  How can I securely wipe the hard drive so that the data on it cannot be recovered?  Although I specifically want help with my Windows PC, it wouldn't hurt if there were suggestions for Macs as well.
Does the war have an ending in Planetside 2? As enemy bases are captured, they just seem to respawn right in the middle of friendly captured territory. This is looking like a perpetual cycle, and none of the three teams ever gets closer than to the very edge of winning the whole continent, only to lose lots of territory again.  So is this by design? Is Planetside 2 eternally to be at war, with no winner ever? I was hoping it would be more like a 'match'. I admit that both are almost the same thing, but there is at least the closure of winning/losing sides this way. Avoiding getting suspended for voting irregularities? Many times when I read threads, I keep on upvoting for the reason being that if someone has put an effort to write a big answer, s/he/it should get some rewards for it.  I recently saw someone getting suspended for voting irregularities.   So, I was wondering if I use the total amount of votes allowed per day, daily, will I be suspended? Probability that a sequence repeats itself Given an infinite sequence $a_n$ of uniformly random integers $0$ to $9$, what is the probability there exist an integer $m$ such that the sequence $a_1$ to $a_m$ is equal to that from $a_{m+1}$ to $a_{2m}$?  What if we restrict to two symbols, or $k$ symbols? Logo Pack - What should I include? What files should i put in a logo pack to give to clients? Should I put small, medium and large version of my logo as well as the vector file. How can I bootstrap? How can I bootstrap Drupal 8 from an external script?  This an example script from the .  require_once __DIR__ . '/vendor/autoload.php'; use PhpAmqpLib\Connection\AMQPStreamConnection;  $connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest'); $channel = $connection-&gt;channel(); $channel-&gt;queue_declare('task_queue', false, true, false, false); echo " [*] Waiting for messages. To exit press CTRL+C\n"; $callback = function ($msg) {   echo ' [x] Received ', $msg-&gt;body, "\n";   sleep(substr_count($msg-&gt;body, '.'));   echo " [x] Done\n";   $msg-&gt;delivery_info['channel']-&gt;basic_ack($msg-&gt;delivery_info['delivery_tag']); };  $channel-&gt;basic_qos(null, 1, null); $channel-&gt;basic_consume('task_queue', '', false, false, false, false, $callback);  while (count($channel-&gt;callbacks)) {   $channel-&gt;wait(); }  $channel-&gt;close(); $connection-&gt;close();   Within a worker script like this, I need to be able to create nodes.  How can I bootstrap Drupal 8 in this script?  ? and  bootstraps passing a fake request to the kernel, which to me looks like a work-around.  In Drupal 7 you could do something like this, apparently.  // Bootstrap Drupal. include_once './includes/bootstrap.inc'; drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL); Consider following structure:  . |_s |_s  |_ss  |_ss+   |_sss  |_ss |_s |_s   How can I demote a subsection to subsubsection without changing markups ?  . |_s |_s  |_ss   |_sss+    |_p  |_ss |_s |_s   How can I promote a subsection to section without changing markups ?  . |_s |_s  |_ss |_s+  |_ss  |_ss |_s |_s   A wrapper command would be excellent  \begin[+1]{level} \section{} \end{level} Converting/using ArcGIS *.style file for/in QGIS (QML or SLD)? I have downloaded a dataset from a government organisation. it comes with a .style file.  I use QGIS 1.8 on windows 7.    Is there a way to use the .style file as a qml or sld? I have tried simply changing the extension but to no avail. Sum of binomial coefficients with index divisible by 4 I am trying to obtain a closed form expression for  $\sum {n \choose 4k}$  I am trying to use the binomial expansion of $(1 + i)^n$ and $(1 - i)^n$. $$(1 + i)^n + (1 - i)^n = 2\left(\sum {n \choose 4k} -\sum {n \choose 4k + 2}\right)$$ Stuck at this now. I can't come up with a way to simplify the second term on RHS. Any help would be appreciated. If $G$ has no proper subgroup, then $G$ is cyclic of prime order This is something I'm supposed to be able to prove for an upcoming test, but I can't find anything to help me prove this in my notes or the chapter, which is on cosets and Lagrange's theorem. If all I start with is the group having no proper subsets, then that means any subset is the whole group. By Lagrange's theorem, that means the index is $1$, but that doesn't get me anywhere. Where do I start? Using Apex Managed Sharing to share an opportunity Here's the use case. When a lead is converted to an Opportunity, I want to automatically share the opportunity with the previous owner of the lead. This is needed because upon conversion, the opportunity ownership is granted to someone else but the original lead owner needs ongoing access to the opportunity.  So:   A partner submits/creates a lead and is the lead owner Lead is converted to opportunity and internal sales person gains ownership Original partner needs to have view/edit access on this opportunity   I know you can use Apex Managed Sharing to share a custom object, but I'm hitting a wall trying to do this with an opportunity since the fields in OpportunityShare are not writable. The following won't even compile as a result:  List&lt;OpportunityShare&gt; oppShares = new List&lt;OpportunityShare&gt;(); for(Id i : oppIds) {    OpportunityShare os = new OpportunityShare(OpportunityId = i);    os.OpportunityId = i; // *** ERROR - not writable ***    os.OpportunityAccessLevel = 'Read/Write';    os.UserOrGroupId = oppIdToLead.get(i).OwnerId;    os.RowCause = 'Manual Sharing';    oppShares.add(os); }  Database.SaveResult[] result = Database.insert(oppShares, false); Possible to do a MySQL foreign key to one of two possible tables? Well here's my problem I have three tables; regions, countries, states.  Countries can be inside of regions, states can be inside of regions.  Regions are the top of the food chain.  Now I'm adding a popular_areas table with two columns; region_id and popular_place_id.  Is it possible to make popular_place_id be a foreign key to either countries OR states.  I'm probably going to have to add a popular_place_type column to determine whether the id is describing a country or state either way. Professionals: Would you choose GIMP over Photoshop and/or Inkscape over Illustrator? How many complements are in "I ask you to clean the room"? How many complements are needed in the below sentence?     "I ask you to clean the room."   This sentence above has one complement or two complements? Is there a proof for this Fibonacci relationship? I was looking at the decomposition of Fibonacci numbers using the definition of $F_n = F_{n-1} + F_{n-2}$, and noted the pattern in the coefficients of the terms were Fibonacci numbers. It appears to hold, and I believe it's true, but I haven't seen a proof for it. Does one exist?  $F_n = 1F_{n-1} + 1F_{n-2}$ $F_n = 2F_{n-2} + 1F_{n-3}$ $F_n = 3F_{n-3} + 2F_{n-4}$ $F_n = 5F_{n-4} + 3F_{n-5}$ etc  This can be generalized to $F_n = F_xF_{n-(x-1)}+F_{x-1}F_{n-x}$ What does Geordi see on the holodeck? We've seen how he interprets people and things with his VISOR, but if the holodeck is all force-fields and holographic imaging, how does he interact in a similar way to other members?   What does the holodeck look like to Geordi LaForge using his VISOR? Is it true that $(R\times S)[G]\cong R[G]\times S[G]$? jQuery - auto size text input (not textarea!) How to do relative imports in Python? Is it possible to show our custom message in QGIS Status bar using python? What is duplicate content and how can I avoid being penalized for it on my site? This is a general, community wiki question regarding duplicate content.  If your question was closed as a duplicate of this question and you feel that the information provided here does not provide a sufficient answer, please open a discussion on .     What does Google consider to be duplicate content? Will the way I am presenting my content result in a duplicate content penalty? How can I avoid having my site's content treated as duplicate content?