Erase Options -- How many is enough?

The Disk Utility under the Install DVD gives you three Erase/write zeros options -- 1x, 7x's and 32. On my PowerBook G4, I did a successful (so far) install of Leopard after many problems with a previous "clean install." (prior install - I didn't erase but did what Apple calls "Erase in Install") Last weekend I used the 7 pass erase/write zeros before the installation on the PB. This took some 4-5 hours. I have an empty HD on my MacPro where I am considering "testing" Leopard. Is it really necessary to erase and write zeros more than One Time? With a 500GB HD, I would guess the 7 pass process would take a day to complete.

Whether or not, a zero out on a new drive is necessary is up for grabs. It can't hurt. What it will do is spare any bad blocks, if any exist. One zero pass is enough. The 7X and 32X are for more complete data destruction, so any data written to the drive previously cannot be easily retrieved.
-mj
[email protected]

Similar Messages

  • Cored to Death - how many is enough for CS5?

    I’ve been searching for info on the ‘best’ PC specs for a new PS machine and haven’t had a lot of luck. The Premiere Pro forum has some good stuff on building out a machine but my main goal is for a cutting edge Photoshop workstation.
    I would like to spec a DIY/custom build that will go up against a couple of dual hex-core 12GB ram Dell machines our IT dept recently bought. These things are screamers but I think they’re a bit of overkill in the processor area – and for what they spent on two of these I’m thinking I could spec-build three or four (and we need them all). I could save some $$ and/or reassign resources (better video, faster I/O) by going with fewer processor/cores, especially if they’re not really needed.
    I’ve got an i7 quad @home that’s no slouch but am leaning toward a single Intel Core i7-980x Hex 3.33GHz, 12GB ram with an OCZ RevoDrive SSD for a boot and two WD VelociRaptor for scratch and data. Add an appropriate mother board, a decent case and power (yes, 64 bit Win 7) and I think this setup should keep up with or out perform the dualies.
    We work on geospatial data that is more big and flat (1 to 8 GB files) vs small and complex and what little benchmarking (system monitoring) I’ve done while working seems to show that all those cores aren’t used a whole lot by our ‘bread and butter workflow – it’s much more dependant on memory and read/write.
    I’d like to get something together for management ASAP so if you have some suggestions or experience in this area I’d love to hear from you…
    Thanks!

    TLL... wrote:
    We have a few older (3 years old) dual quad-core machines here too that I wasn't really all that impressed with.
    Can you be more specific?  Just curious.
    I ask because my main workstation is a 4 year old dual processor dual core machine (Dell Precision 490) and it really chews through Photoshop work.  It just doesn't seem to get bogged down anywhere near as easily as any of the single processor machines I've used, and I tend to do a LOT of multitasking.  It's also very stable on Windows 7 Ultimate x64.
    You will, of course, want the fastest memory bandwidth and interprocessor communications pipeline you can afford.  And fast disk (e.g., RAID-based) access.  A lot of things have to come together to make a computer a throughput workhorse.
    -Noel

  • How do I view what slide I'm on out of how many I have total in keynote? I know on powerpoint it's at the bottom right of the window but I can't find it on keynote nor can I find the option to make it appear. Any help would be greatly appreciated.

    How do I view what slide I'm on out of how many I have total in keynote? I know on powerpoint it's at the bottom right of the window but I can't find it on keynote, nor can I find the option to make it appear. Any help would be greatly appreciated.

    Your steps so far are OK but you may want to try:
    1 Trash your user library Caches folder (House Icon with short name in Finder window (hard drive window)GOTO:House icon > Library folder > caches folder
    2 Trash the com.apple.Safari.plist file in User library > preferences folder > Safari.plist as well as removing the library Safari folder its self.
    3 you can selectivly re-install Safari 2.0 from your OS Tiger Install disk 1, (see Knowledge base article 301229 for how to just select the Safari Application) without doing a complete system Archive and Install.
    4. Create a new Test user account on the system and test how Safari responds in the Test user, see if its a user related issue and not system issue.
    5. Still no Safari response? have to do an Archive and install (not preserving user and network settings)article 107120
    PS. Issue may be related to actual internet connection connectivity, power cycle cable modem and router or airport if using one as well as the computer(keep unplugged for 3-5 min) and plug the cable modem in and then the router/airport then power on the computer. Do the Airport Admin utiliy (applications, utilities on HD_1)update.
    - do a hard reset of airport knowledge base article 108044(Express base) and 107451 (Extreme base)
    - Check with internet provider for connection issues "cannot find server" ect.

  • How many entries can we put in the select options

    Hi all,
    As per  my requirement I am trying to store the data in the select-option( s_kunnt)  as below
    select kunnr from kna1 into (l_kunnr) where
                and spart in p_spart.
      move 'I'         to s_kunnr-sign.
      move 'BT'        to s_kunnr-option.
      move l_kunnr to s_kunnr-low.
      move l_kunnr  to s_kunnr-high.
      append s_kunnr.
    endselect.
    Using s_kunnr in the select statement to fetch the data.
    When the customer numbers are more than 1800 in the s_kunnr, select statment going to the dump. Is number of entries in the select options are restricted for some count( around 1800)?.
    How many entries can we put in the select options?
    Thanks
    Regards
    Raj.

    Firstly, there is an error in your code. You should do the following instead:
    move 'I' to s_kunnr-sign.
    move 'EQ' to s_kunnr-option.
    move l_kunnr to s_kunnr-low.
    append s_kunnr.
    To answer your original question, the limit depends on the field width you are using in the ranges. If the field width is small, you can have thousands of entries in the range table.
    The limitation is in the length of the SQL statement string generated by the ABAP OPEN SQL engine. With the way I defined it above, the statement would have WHERE KUNNR IN ( 'value1', 'value2', 'value3'). With way you defined it, it would have WHERE KUNNR BETWEEN 'value1' and 'value1' and KUNNR BETWEEN 'value2' and 'value2'.
    When the range table is so large that it results in a short dump, you should look into FOR ALL ENTRIES option of SQL.

  • How many optional allowed in the query?

    Hi,
    Data base is getting disconnected while running the below sparql query (Query with 9 optional conditions).
    I tested the query with 5 optional its working fine but, its not working for more than 5 optional.
    How many optional allowed in the query?
    Please advice me to solve this problem.
    Error Detail: ORA-03113: end-of-file on communication channel
    SELECT bi, OWNER,name,usage,notes,icto,app,ssd,ssdname,ssdid,sdname,sdarchitect,schedule
    FROM TABLE (sem_match('{
    ?bi rdf:type di:Bulk_Interface .
    ?bi di:hasBulkInterfaceItOwner ?OWNER .
    ?bi di:hasBulkInterfaceName ?name .
    ?bi di:hasBulkInterfaceRecipientApplicationArea ?usage .
    ?bi di:hasBulkInterfaceRecipientFeederType ?notes .
    ?bi di:hasBulkInterfaceSupplierApplicationId ?icto .
    ?app ds:hasConceptualSourceApplicationIctoId ?icto .
    ?ssd ds:hasConceptualSourceApplication ?app .
    ?ssd ds:hasConceptualSourceSubdomainName ?ssdname .
    ?ssd ds:hasConceptualSourceSubdomainIctoId ?ssdid .
    ?sd ds:hasConceptualSourceSubdomain ?ssd .
    ?sd ds:hasConceptualSourceDomainName ?sdname .
    ?sd ds:hasConceptualSourceDomainArchitect ?sdarchitect .
    ?bi di:hasBulkInterfaceDeliverySchedule ?schedule
    optional {?bi di:hasBulkInterfaceRecSet1AverageStorageRequirements ?avgsize}
    optional {?bi di:hasBulkInterfaceWorstStorageRequirements ?maxsize}
    optional {?bi di:hasBulkInterfaceRecSet1AverageNumberOfRecords ?avgrec}
    optional {?bi di:hasBulkInterfaceAverageNumberOfRecords ?avgrec}
    optional {?bi di:hasBulkInterfaceRecSet1WorstNumberOfRecords ?maxrec}
    optional {?bi di:hasBulkInterfaceWorstNumberOfRecords ?maxrec}
    optional {?bi di:hasBulkInterfaceTransferMethodJob ?job}
    optional {?bi di:hasBulkInterfaceDataFileAvailability ?post}
    optional {?bi di:hasBulkInterfaceBusinessDescription ?descr}
    sem_models ('IFM_CURR', 'SRC_CURR'),
    SEM_Rulebases('OWLPRIME'),
    sem_aliases(SEM_ALIAS('di','http://www.cse.com/sbip/dwh/mdm/data_interface#'),
    SEM_ALIAS('ds','http://www.cse.com/sbip/dwh/mdm/data_sources#'))
    , NULL));
    Let me know if you need any other details.
    Regards,
    Kavitha.
    Edited by: 789259 on Aug 3, 2011 2:01 AM

    If possible, I would suggest that you upgrade to the latest release: 11.2.0.2.0. It has many bugfixes and enhancements.
    There is no limit on the number of optionals per query. I suspect that the use of the same new variables (?avgrec and ?maxrec) in the parallel optional clauses is the reason you are seeing the error in this particular case. If you use different variable names does the error go away? If needed, you can use a coalesce in the outer SQL SELECT to get the same behavior as before (e.g. COALESCE(avgrec1, avgrec2) as avgrec).
    Thanks,
    Matt

  • Hi, is there any option how I can edit duration of multiple video clips (not stills) in iMovie 11, lets say if I want them 2 seconds long? Many thanks for any advice... Tom

    Hi, is there any option how I can edit duration of multiple video clips (not stills) in iMovie 11, lets say if I want them 2 seconds long? Many thanks for any advice... Tom

    Yes.
    iMovie 11 tutorials:
    http://help.apple.com/imovie/
    http://www.apple.com/ilife/tutorials/#imovie
    and also these:
    http://www.kenstone.net/fcp_homepage/imovie_09_stone.html
    http://www.kenstone.net/fcp_homepage/imovie_09_stone.html#interface

  • Report execute time nd how many records will be returned before hitting the "run" option?

    Post Author: Prasad15
    CA Forum: WebIntelligence Reporting
    Is there any way to know how long the report executes and how many records will be returned before hitting the "run" option?
    Regards
    Prasad

    To know if the report is going to return more than 10,000 records, you first have to run the query with a 'select count(1) from ... where ...' (with the same from and where clauses as you normal query). Since this takes about the same time as runnng your report, I wonder if you really gain anything (although formatting may take some time too).
    You may simplify the select count(1) query by omitting all the lookup tables that are only needed for formatting. That way your query may run a lot faster. You can put this in your after parameter form trigger.

  • MAC OS X 10.9.3 setting up 0365 exchange on mail 7.3, but cannot find the option to adjust how many days worth of mail to store. At the moment it is only synching todays mail. Please assist.

    MAC OS X 10.9.3 setting up 0365 exchange on mail 7.3, but cannot find the option to adjust how many days worth of mail to store. At the moment it is only synching todays mail. Please assist.

    MAC OS X 10.9.3 setting up 0365 exchange on mail 7.3, but cannot find the option to adjust how many days worth of mail to store. At the moment it is only synching todays mail. Please assist.

  • Disk utility will not boot using COMMAND   R. It won't give me the 'ERASE' option when I open Disk Utility. How do I wipe my hard drive?

    Disk utility will not boot using COMMAND   R. It won't give me the 'ERASE' option when I open Disk Utility. How do I wipe my hard drive?

    If you're truly running 10.6.8, there is no Recovery partition - that didn't come along until 10.7x.
    You'll need to use the set of gray discs that originally shipped with your model. If you don't have them, you can always get your serial number from the bottom of the casing and call Apple to get a set of replacement discs. These will run you about $20 + shipping & taxes. Once you have the discs, boot from Disk One and use Disk Utility to erase your HD and then reinstall whichever version of OS X that shipped with your model. No way around of getting the discs.
    Clinton

  • How many gb I need and is 16 bg enough.

    how many gb I need and is 16 bg enough

    kenneth almere wrote:
    how many gb I need and is 16 bg enough
    No one here could possibly know if 16GB is enough for your intended usage.  Have you had an iPhone or smartphone before?  What was it's capacity?  Did you ever run out of space?
    I have an old iPhone 4 8GB that worked wonderfully, but I made sure to be very selective about what apps I installed, I deleted apps that I no longer needed or wanted, and I imported my photos & videos to my computer on a regular basis and deletde the unneeded ones from my iPhone.  When I got a larger capacity iPhone, my usage did change, mainly because I had more flexibility.
    To be honest, if you can afford the difference in price, it's worth getting the largest capacity version of the iPhone that you want.  For example, a $200 difference to go from 16GB to 128GB is a decent deal, but even on my current device, I'm rarely using more than 10 GB of storage.

  • TS3899 I can't find the option to set how many emails display on my iphone

    I can't find the option to set how many emails display on my iphone. Help!! This always used to be under settings mail but the option seems to have disappeared.

    That Number of Mail to be Displayed on an iOS Device Option has been removed after the iOS 7 Update, you can find the other users having the similar Question but with No Solution yet.
    https://discussions.apple.com/thread/5321047?start=0&tstart=0

  • How many services is enough?

    Hi
    I thought I'd start with a general question!
    How many services are you using and managing?
    Do you have a feel for the optimum number of services per line of code?
    How do you judge whether you have too many or too few?
    Thanks for any of your thoughts....
    Cheers
    Rorie
    SOA Convert
    www.buycake.co.uk

    Maybe they should be there to help you?
    OH holy ****, what a concept.
    ...especially considering that our local Wal-mart's connection center associates have proven more knowledgeable and helpful than any associate the local VZW store has. All they see money. All they think about are the things they can say to get it. Signed up in October, got <a Thunderbolt> and cannot wait to get the **** off Verizon (oh and only took three months for my corporate discount to be applied. After the first 24 hours of time spent on hold with them, I quit keeping track). Unless their game plan is "get bought out by AT&T," they should really rewrite the book.
    <Keep it clean, Thank you>
    Message was edited by: Verizon Moderator

  • HT5654 I just upgraded to the latest operating system, but it is hung up, no matter how many times I page through the options and hit agree it won't go past the agree/disagree page.

    As the title says, my iTunes just updated. So it asked to update my iPhone operating system. I'm logged in but no matter how many pages I link through or page through it won't accept "agree" and move on.  Now I can't do anything with the phone.

    It randomly decided to start working after three hours, nevermind.

  • How many user accounts on one computer?

    I did search but found nothing directly relevant. We have one laptop with one administrator account. How many user accounts besides mine am I allowed?
    Thanks in advance :o)

    Ah good, 10 or less will work for sure then.
    More than one account can be logged in at a time? How does that work?
    In System Preferences>Accounts, unlock the lock, click on Login Options, at the bottom enable Fast User Switching.
    Sounds like a nightmare waiting to happen maybe?
    Maybe the opposite!
    If you have enough RAM & HD Free Space it allows others to use the Mac without you quitting all your work, and it keeps things separate. Great if you have young ones using it because you can make managed accounts & control which APPs they can use & other things... and without them destroying your data.

  • How many users/ schemas can we create in an oracle database?

    How many users can we create in an oracle database? Or how many users can oracle handle?
    Problem-
    I have to store information of ontologies (I will use countries instead) in db.
    I have to store information regarding countries.
    I have 13 tables in all to maintain for each country.
    Now there are two approaches:
    1) keep only 13 tables. Have an extra column in each table to indicate that a particular
    row stores information for which country.
    2) create a new user/ schema for each country. So we can get rid of the extra column
    needed in 1st approach.
    I have used the second approach. This is because number of entries in each table for a
    given country will be large.
    So initially when the s/w is installed I create a central-user. Each time data for new
    country has to be entered central-user creates a user/ schema, and creates tables for
    this user/ schema. The central user can access the tables of all the countries by
    country_name.table_name. By this approach I believe searching would be easy.
    If there is any flaw in my approach kindly mention it.
    Thank you

    There is no (practical at least) limit to the number of users & schemas you can have in Oracle.
    Your approach, however, is not going to scale nearly as well as the first option you outlined (adding a column). You are going to end up caching every possible variation of the various queries you're going to be executing because you will be referring to so many different tables, which is going to mean that you are doing a lot more work to parsing statements and generally churning through the shared pool. If you create enough users, you're liable to start hitting ORA-04030 errors because your shared pool is so fragmented.
    Additionally, you're likely going to end up with a whole lot of dynamically generated SQL to accommodate new schemas getting added over time which is going to cause you even more pain. Figuring out dynamically what table to join in is a heck of a lot more difficult for the programmer to write and for the database to handle than simply passing in a different country code.
    If you're concerned about having too much data, you can have your cake and eat it to by adding the country column and partitioning the tables based on country.
    Justin
    One other item I forgot to mention is maintainability. Having dozens or hundreds of "identical" schemas makes maintenance a huge pain because something like adding a new column now requires dozens or hundreds of separate DDL statements. You're almost guaranteed that some schema isn't going to be in sync-- it's going to miss a column or miss an index, etc.
    Message was edited by:
    Justin Cave

Maybe you are looking for

  • Configure TopLink with a datasource

    How can I configure toplink to use a datasource using JDev 10.1.2?

  • My iWeb page is not displaying correctly?

    hi I created a site in iWeb 08 (version 2.0.4. - 830A43), exported to a folder, and then uploaded to the web via ClassicFTP (Mac). Does not display correctly, but not sure why. temp URL is http://223.130.24.65/~vstacoma/Site/home.html The font appear

  • How To Retrieve The Top 50% Of A Column - or, any other %-age.

    How do, folks. If the title is somewhat too vague, lemme 'splain... Basically, let's say I have a data set where one of the columns is an amount paid - Amt_Pd - and another column is the date when that transaction took place - Date_Pd - and another i

  • Post 2010-005 security update freshclam now complains

    I applied the 2010-005 security update to 3 of our Xserves. These invoke freshclam via a cronjob (/usr/bin/freshclam --no-dns --quiet). Post security update we now get this output mailed to us after the cronjob runs: LibClamAV Warning: Cannot dlopen

  • Query LPAR in oracle database.

    Hi Folks I was assigned to query LPAR and user_id in some databases. Based on the info on excel sheet, we are going to match up LPARs with physicals servers, and I'll then determine how many unique database ids exist across each physical server. I kn