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  • How full is too full for mechanical hard drives?

    - by Sunny Molini
    I have heard many claim that it doesn't matter how full a drive is until it starts cutting into temp and virtual memory space. This doesn't make sense to me, given the nature of how the data is transacted on a hard drive. The inside of the platter presents less data per revolution than the outside of the drive does, by significant factors. The inside 40% of the radius of full size hard drive is used for the spindle, so only the outside 60% is used for data storage, but that still means that the inside track of a hard drive presents data 60% slower than the outside track. By my calculation, a Hard drive that is only 10% full should perform about 2.25 times faster than a hard drive that is 90% full, assuming that the flow is constrained by other factors. Am I wildly off base here? For all the drives I know, even the top speeds of the first 1% of the drive would be well within the bandwidth provided by a SATA 2 connection.

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  • Windows drive letters A: and B:

    - by Workshop Alex
    This is a question that just popped into my mind and I can't help but wonder why it's still common for a Windows installation to be installed on C: with all other drive letters going up from D: to Z:. In the early MS-DOS times, all we had were floppy disks and they were at A:. When the 3.5 inch floppy started to replace the 5.25 floppy, many people had an A: and B: drive. Then the hard disk became popular and the hard disk was at C: because A: and B: were taken. Then the 5.25 floppy disappeared and most computers had a gap between A: and C:. Nowadays, the 3.5 floppy is just too outdated so A: disappeared too. All disks now start at C:. Yeah, I know I can assign my own drive letters and I've done so with my data disks. My installation disk will just continue to be stuck at C: and I don't really mind. I have no problems with drive letters. But why do the new Windows versions just continue to install themselves by default on C: instead of assigning the letter A: to the boot hard disk?

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  • How can I determine the sector size on an external hard drive?

    - by sigint
    Hard drives are transitioning from 512 byte to 4096 byte sector sizes, and it looks like Windows XP won't support these newer drives without additional software (such as WDalign from Western Digital) My question is: how does this affect external hard drives? I'll be buying a 1TB USB external drive, and it'll be plugged into a mix of Windows 7 and XP machines. Is there an easy way to tell what the sector size on an external hard drive is?

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  • Can WD3200AZRX SATA-3 hard drive work on SATA-2?

    - by Roberts
    I know this question is already been asked a lot of times. I am buying new hard drive today, but I am worrying that it wont work on my motherboard Gigabyte GA-945PL-S3. I want to buy this hard drive. It's pretty expensive and I don't want to get dissapointed. I can't find any documentation about jumper settings and that's why I am asking this question in this site, I hope somebody helps me. Have a nice day!

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  • Performance boost for MacBook: Hybrid hard drive or 4GB RAM?

    - by user13572
    I have an aluminium 13" MacBook with 2GB or RAM and 5400RPM 500GB hard drive. The main tasks I perform are developing iPhone and Mac apps in Xcode and websites in Coda. I want to improve the performance so I am considering buying 4GB of RAM or a 500GB Seagate solid-state hybrid drive. What is likely to provide the biggest performance boost?

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  • Does having your page file on decrease the life expectancy of your hard drive?

    - by user695874
    If I have my page file turned on in Windows as opposed to having it turned off as shown below: Would having the page file turned on decrease the life expectancy on my Hard Drive? If so, how much would the life decrease say with regular use? (4 hours a day) I'm thinking it would decrease some just because there would be more writing to the hard drive, but I wasn't sure if it would be too negligible to even matter.

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  • How do I change the space I allocated to my virtual hard drive in VirtualBox?

    - by Guest
    Hi, I have a Win7 x64 virtual machine running inside VirtualBox. When I first setup the system I gave the virtual hard drive 20gb of space to work with, but I also set it to dynamically expand (or so I thought). Unfortunately I ran out of space and the drive is not expanding/changing.. and I can't find a way to alter the size of it. Is there anything I can do in this situation. Thanks in advance.

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  • Hard drive not being recognised after booting into Windows?

    - by Sam152
    I just got myself an internal Western Digital caviar black 1TB hard drive. I installed it without too much trouble. The SATA's are plugged correctly and the bios is recognizing it, but it doesn't show up in Windows 7. Does anyone have any troubleshooting ideas or tips I can step through to try and make Windows see my new drive?

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  • Performance boast for MacBook: Hybrid hard drive or 4GB RAM?

    - by user13572
    I have an aluminium 13" MacBook with 2GB or RAM and 5400RPM 500GB hard drive. The main tasks I perform are developing iPhone and Mac apps in Xcode and websites in Coda. I want to improve the performance so I am considering buying 4GB of RAM or a 500GB Seagate solid-state hybrid drive. What is likely to provide the biggest performance boast?

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  • Keep Windows Installer from using largest drive for temporary files

    - by stefan.at.wpf
    By default Windows Installer uses the largest drive for temporary storage, no matter if that's needed (meaning there would also be enough space on the system drive). Taken from http://msdn.microsoft.com/en-us/library/aa371372%28VS.85%29.aspx: During an administrative installation the installer sets ROOTDRIVE to the first connected network drive it finds that can be written to. If it is not an administrative installation, or if the installer can find no network drives, the installer sets ROOTDRIVE to the local drive that can be written to having the most free space. Now my system drive is an SSD, my largest drive is a RAID, that spins down when it's not used. Remember the SSD as system drive? Everything is silent now! Until I install something and Windows Installer wakes up my RAID again just to put a small .tmp file on it... How can I prevent Windows Installer from using the largest drive as temporary storage? Can I maybe set some access rights to disallow the Windows Installer to write on my RAID drive? Any other ideas? Thank you!

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  • how do you view / access the contents of a mounted dmg drive through TERMINAL hdiutil diskmount

    - by A. O.
    My external USB drive failed. I made a .dmg image file of the drive using disk utility. Later I was not able to mount the .dmg image. I used terminal hdiutil attach -noverify -nomount name.dmg diskutil list diskutil mountDisk /dev/disk4 then received the following message: Volume(s) mounted successfully However, I cant see the drive or access its contents through Finder. DUtility shows the drive as ghost but I still cant mount it using diskutility. Terminal tells me that the drive is mounted and constantly shows it in the diskutil list. pwd is not the mounted .dmg image. I dont know how to enter into the mounted image drive to see its contents. So in case what I said sounds like I see the files in the mounted image no this is not the case. I do not know how to access or even change the pwd within Terminal. I was hoping to see the mounted drive tru finder but I do not see that. So I need help as to how to find a way to access the mounted image drive if it was really mounted. Terminal says that it was and it shows it under diskutil list as a /dev/disk4. Can someone please help me access the files on this drive?

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  • Linux RAID: Replacing Failed Drive...permanantly

    - by user137519
    Okay, odd question here. I have a server with RAID 5. A drive failed, in a really physically in a really odd way. On the machine it boots and is seen by the BIOS but...no partition can be seen on the drive consistantly (in and out). 2 out of 3 drives working...I made new spare disk and added it, RAID 5 rebuilt clean. All appears well but...when I reboot it keeps trying to use the 2nd drive which doesn't give any partition data, so of course the RAID 5 gets 2 out of 3...again. The status of my drive is as follows: /dev/sda2:Good /dev/sdb2 (drive has physical problem so no partition data) bad, /dev/sdc2:good /dev/sdd2:good. Every time I reboot the mdadm system seems to keep trying to use /dev/sdb which has physical failure (although spins and is detected). /dev/sdd is the new drive I created. I added /dev/sdd to the raid and it rebuilds the raid but this action isn't memorized upon reboot so it keeps listing /dev/sda and /dev/sdc but doesn't use the perfectly good /dev/sdd until I re-add manually. I've tried removing the dead drive with the mdadm tool, but as it cannot see /dev/sdb paritions it will not fail or remove it (says partition doesn't exist). the /etc/mdadm.conf was automatically made on the original OS install which only lists: DEVICE partitions MAILADDR root ARRAY /dev/md2 super-minor=2 ARRAY /dev/md0 super-minor=0 ARRAY /dev/md1 super-minor=1 Basically just the raids to use on boot. I need to remove this semi-dead drive (/dev/sdb) but I'd prefer to know why this is happening before I do. any ideas or suggestions. I supposed I could attempt to clone/replace /dev/sdb (the partitions on drive show up, then disappear shortly after) but given the partition "chester cat" behaviour this seems risky to me and as I have a working "spare" it seems unnecessary. Thanks in advance for your insight.

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  • Drive security settings in Windows 8 Pro

    - by Donotalo
    My PC OS is Windows 8 Pro x64. Windows 8 seems confusing. D:\ drive is supposed to be used solely by a single user, who is in Users group of the PC. The requirement is... that user will have full control of D drive. Admins will have full control of D drive. All other users can only list drive contents. No file could be opened. My account is admin account. From D drive's property Security tab, I've set the following: Allow "List folder contents" for Authenticated Users group. Allow "Full control" for SYSTEM. Allow "Full control" to specific user, who's supposed to use the drive. Allow "Full control" for Administrators group of the computer. Allow "List folder contents" for Users group. After setting this up, the specific user have full control of D drive. No other user can open any file on D drive. But though my account is an admin account, no file on D drive could be opened from my account! Why is this happening and how files can be opened from my account? Note: All accounts in this PC are local accounts.

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  • Network external hard drive reports not enough free space

    - by mzhang
    I'm running an Ubuntu (10.04) Samba server on a local network. The server has a 50GB internal drive with only 24MB free. I've shared a folder /samba from that drive. I also have a 1TB NTFS external hard drive mounted to the system. There is a symbiotic link from the Samba shared folder on the nearly-full internal drive to the plenty-of-free-space external drive (i.e. /samba/external_hd). I wish to copy a 3.25GB folder into the (remote) external hard drive, via a Mac (10.6.8). The Mac reports (correctly) that there's 24MB free on the server, and so will not let me copy the folder on the Mac over to the external drive (dragging the folder into /samba/external_hd), failing with a "server does not have enough free space" error. However, it seems that I can still scp the folder into the external drive, via the symbolic link. Is there a reason as to why this is happening (and are there any ways to prevent it)? Is this even good practice (to mount a drive and link into the directory)?

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  • How do I mount a USB floppy disk drive?

    - by Jocky B
    I have tried to mount my usb floppy disk drive in 11.04 Natty. So far I have managed to use the udisks --mount/dev/sdf command in terminal, but get a message that I have not stated a filetype john@john-desktop:~$ udisks --mount /dev/sdf Mount failed: Error mounting: mount: you must specify the filesystem type This is the result I get when trying to mount the usb floppy disk drive. Anyone know how to proceed?

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  • Test-Drive ASP.NET MVC Review

    - by Ben Griswold
    A few years back I started dallying with test-driven development, but I never fully committed to the practice. This wasn’t because I didn’t believe in the value of TDD; it was more a matter of not completely understanding how to incorporate “test first” into my everyday development. Back in my web forms days, I could point fingers at the framework for my ignorance and laziness. After all, web forms weren’t exactly designed for testability so who could blame me for not embracing TDD in those conditions, right? But when I switched to ASP.NET MVC and quickly found myself fresh out of excuses and it became instantly clear that it was time to get my head around red-green-refactor once and for all or I would regretfully miss out on one of the biggest selling points the new framework had to offer. I have previously written about how I learned ASP.NET MVC. It was primarily hands on learning but I did read a couple of ASP.NET MVC books along the way. The books I read dedicated a chapter or two to TDD and they certainly addressed the benefits of TDD and how MVC was designed with testability in mind, but TDD was merely an afterthought compared to, well, teaching one how to code the model, view and controller. This approach made some sense, and I learned a bunch about MVC from those books, but when it came to TDD the books were just a teaser and an opportunity missed.  But then I got lucky – Jonathan McCracken contacted me and asked if I’d review his book, Test-Drive ASP.NET MVC, and it was just what I needed to get over the TDD hump. As the title suggests, Test-Drive ASP.NET MVC takes a different approach to learning MVC as it focuses on testing right from the very start. McCracken wastes no time and swiftly familiarizes us with the framework by building out a trivial Quote-O-Matic application and then dedicates the better part of his book to testing first – first by explaining TDD and then coding a full-featured Getting Organized application inspired by David Allen’s popular book, Getting Things Done. If you are a learn-by-example kind of coder (like me), you will instantly appreciate and enjoy McCracken’s style – its fast-moving, pragmatic and focused on only the most relevant information required to get you going with ASP.NET MVC and TDD. The book continues with the test-first theme but McCracken moves away from the sample application and incorporates other practical skills like persisting models with NHibernate, leveraging Inversion of Control with the IControllerFactory and building a RESTful web service. What I most appreciated about this section was McCracken’s use of and praise for open source libraries like Rhino Mocks, SQLite and StructureMap (to name just a few) and productivity tools like ReSharper, Web Platform Installer and ASP.NET SQL Server Setup Wizard.  McCracken’s emphasis on real world, pragmatic development was clearly demonstrated in every tool choice, straight-forward code block and developer tip. Whether one is already familiar with the tools/tips or not, McCracken’s thought process is easily understood and appreciated. The final section of the book walks the reader through security and deployment – everything from error handling and logging with ELMAH, to ASP.NET Health Monitoring, to using MSBuild with automated builds, to the deployment  of ASP.NET MVC to various web environments. These chapters, like those prior, offer enough information and explanation to simply help you get the job done.  Do I believe Test-Drive ASP.NET MVC will turn you into an expert MVC developer overnight?  Well, no.  I don’t think any book can make that claim.  If that were possible, I think book list prices would skyrocket!  That said, Test-Drive ASP.NET MVC provides a solid foundation and a unique (and dare I say necessary) approach to learning ASP.NET MVC.  Along the way McCracken shares loads of very practical software development tips and references numerous tools and libraries. The bottom line is it’s a great ASP.NET MVC primer – if you’re new to ASP.NET MVC it’s just what you need to get started.  Do I believe Test-Drive ASP.NET MVC will give you everything you need to start employing TDD in your everyday development?  Well, I used to think that learning TDD required a lot of practice and, if you’re lucky enough, the guidance of a mentor or coach.  I used to think that one couldn’t learn TDD from a book alone. Well, I’m still no pro, but I’m testing first now and Jonathan McCracken and his book, Test-Drive ASP.NET MVC, played a big part in making this happen.  If you are an MVC developer and a TDD newb, Test-Drive ASP.NET MVC is just the book for you.

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  • Hard drive not correctly recognized on a new Windows 7 installation, but works correctly on Windows XP

    - by david
    I'm having problems configuring a hard disk in a brand new, clean Windows 7 installation. System specs: Hard disk: WD VelociRaptor WD6000HLHX (600 GB, 10000 RPM) Motherboard: Gigabyte Z77X-UD3H BIOS SATA mode set to AHCI (not RAID), with disk connected to SATA0 (6 Gb/s port). Windows 7 Enterprise SP1 64-bit The disk is recognized by the BIOS and is correctly identified, with the name and size correctly reported. Windows recognizes the disk itself and reports the device is functioning correctly, but it doesn't appear in Explorer. Disk Management shows the drive, but incorrectly states that it is uninitialized and has no partitions. If I try to initialize the drive, I get an error saying that "the system cannot find the file specified" (what file?). Before connecting the drive to the new machine, I partitioned and formatted it under Windows XP SP2, creating 2 partitions (MBR, not GPT) and copying over a boatload of data. However, none of this data appears under Windows 7. If I put the disk back into the Windows XP machine, I can access the disk and all of its data. Is it possible to get Windows 7 to correctly recognize the disk without having to erase it and start over? If so, how do I do so? I checked this question, which seems to cover the same issue, but it didn't help.

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  • Is there any free software to check for issues with a DVD drive?

    - by AgentConundrum
    I don't usually play movies on my laptop (prefer the standalone with the tv), but I tried to watch one the other night, and noticed playback was really choppy and had audio artifacts in places. I thought it could be related to memory issues so I rebooted and tried again, but the results were the same. I considered that it could be an issue with the disc, so I tried to clean it but again there was no change. I don't think the problem is with the disc, because I tried another disc and it also had the same problem. I don't think I've ever watched the second disc since I've had it, so it should have been safe in its jewel case. Also, there were no issues when I watched an episode off the first disc in my standalone player. What I'm wondering is: are there are any (free) utilities that can check for issues with the drive itself? I looked around but most of the software I found focuses on integrity checks for the disc, not the drive. I have had issues with this laptop recently (had to replace the keyboard when the cat damaged it while I was cleaning dust out and the machine was ripped apart, also replaced part of the chassis after I cracked it when I tried to open it not knowing a screw was still in it) so I may have just replaced the drive incorrectly. I'm going to check on this while I await an answer to this question. Thanks.

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  • what is the fastest way to copy all data to a new larger hard drive?

    - by SUPER user
    I was certain this would have been covered before, but I cannot find an answer amongst all the almost-duplicates that come up; sorry if I've missed something obvious. I have a full 320gb disk inside my machine, a new 1tb disk to replace it, and a USB 2.0 chassis. It is only data on a single partition, no OS/apps involved, and the old drive will be kept somewhere as backup (no secure wiping etc). The simple option would be to put new disk in USB chassis, copy files, then swap them over. But for USB pen drives, reading is around 4x faster than writing. If the same is true for a USB SATA chassis (is it?) then it would be significantly faster to swap the drives first and read from the old drive over USB, right? Then the other consideration is that copying lots of files is usually slower than a single file of equivalent size. Is Windows 7 smart enough to do everything in a single lump like that, or is there specialised software that should be used instead? (Even if SATA-SATA copying is faster than involving USB, knowing what to do when it isn't an option is useful information.) Summary: Does a USB SATA chassis suffer from a read/write inequality? (like a USB pen drive does, but unlike a direct SATA connection) Can Windows 7 do sequential access? (I can't find confirmation if Robocopy does this.) Or is it necessary to use a bootable CD/USB with something like Clonezilla to achieve sequential copy speeds?

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