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• My WD passport detected but not shown on my computer

  - by Rakesh Patel

  1TB WD harddisk is detected in laptop but drives not visible on my computer. Under disk managment drives shown without letters. Right clicking on these drives give 2 options: Delete volume Help. The same harddisk was running well on the same laptop a day before. It is also showing full size of hard drives, Healthy (Primary Partition) etc. (this happened after harddisk usage by guest). Harddisk is new only (about 5 month usage) Please suggest: Is there hardware related problem inside harddisk, if so is it repairable? Is there any option to recover data?

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• Disable RAID Controller

  - by B.Mr.W.

  I have some decent HP Proliants server that come with "HP Smart Array P410i Controller" enabled, I am using these boxes to set up a Hadoop cluster and I know, RAID is for sure a no-no for Hadoop since the application itself will take care of data redundancy and extra intelligence provided by RAID won't be helpful and might turn down the performance. I tried to disable the devices at the BIOS and the box cannot even access the disk afterwards. So I am assuming the controller is sitting between disks and mother board, and we have to turn it on and configure it to "level0" or something like that. I am wondering what should I do to "disable" the RAID functionality so it will fit into the Hadoop environment.

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• "Disk Not Found" Error when trying to install iso image of CentOs on ESXI using VSphere

  - by kamal

  When trying to install CentOs setup as an iso image on datastore, i get an error : "Disk Not Found". I am using ESXi 4.1 as host VM. Is there a way to attach DVD/CD as iso image ? I tried "Connect at Power on" Checked and Connect CD/DVD on the VSphere Console, but i still am unable ot get the iso image recognized as a DVD mounted image: Solved: if i look at the image size, it was 11 MB, so it WAS a boot iso, but nithing else, if we compare it with other boot images with complete iso's therein lies the solution. This boot.iso was from rBUILD/Conary packaging

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• How can I combine non-identical disks efficiently?

  - by Odys

  There are some not-identical disk of various capacities that I want to combine (somehow). Since there are no duplicate models, I can't use raid between none of them. Is there a way to use them efficiently while being safe? What I have in mind is a software that will use them as if it were Raid-5 or something. I really don't care about max speed. I want in the end to have as less logical drives as possible. Also, I don't mind spending some money on hardware, if needed.

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• Certain drives in RAID 5 set intermittently are not recognized

  - by hydroparadise

  I have a curious problem in that 1 (sometimes 2) drives do not get recognized in a RAID 5 set. The server is getting rather old at 5 to 6 years, but still seems to function well once the machine sees all drives. So that leaves me with three areas to consider: the motherboard, the SATA RAID card, or the individual hard drives themselves. I am leaning toward the RAID card, but have not had much dealings with RAID cards. What would cause individual drives not to be recognized in the set? If it was the card, I would think that it would be all or nothing. If it were a single drive, is it possible that it would only work sometimes? The only other thing to consider is that that they are different drives (Seagate and Western Digital) but all around 80 GB. SATA RAID controller is 3ware Escalade 8506-4LP Motherboard is a SuperMicro P4SPA+ Am open and available for more details if needed...

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• Looking for an actual experience of RAID 5 2 drive failure?

  - by Brian

  I'm wondering if anyone has any personal experience of RAID 5 2 drive failure with large drives? As I understand it, the theory is that with large 1-2TB drives, if one drive fails in the raid set, it needs to rebuild everything so is thus hitting all the other drives very hard, and the chance of another failure goes up, especially if the drives were from the same manufacturing batch. And if you lose another drive, you lose all the data. This is usually explained after the statement "RAID is not backup" which I agree with. The theory of this makes sense, and I understand it, but does it really happen?

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• How to diagnose a Windows XP hard crash

  - by Jon

  I have a 64-bit Windows XP machine which has hard crashed several times today. The symptoms are that the screen just goes blank, then the reboot cycle starts. There is no blue screen and even though it is switched on, no crash dump file is created. On all occasions it has happened during a period of high CPU/memory activity. I have run a full Dell diagnostics with no failures. Any ideas how to track this down further? Thanks.

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• ext4: error loading journal

  - by cloudyOutside

  I have an external hard drive with two partitions: A small FAT32 which is mostly empty and works fine and a large ext4 with tons of data, most of which isn't backed up. The ext4 is visible, but can't be mounted. I get an "error loading journal" error. The drive is a Western Digital Caviar Blue 500GB. Roughly 30GB of that is FAT32 and the rest is the ext4. The light on the enclosure turns red when reading from the bad partition. It was made by Cavalry. There wasn't any warning, but coincidentally, I've been thinking lately that I should get two large capacity drives for real backups. Is there anything that can be done? I'm not even sure I have enough storage to backup everything even if it is redeemable.

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• Windows 7 keeps losing drive letters

  - by Dean Perry

  Windows 7 loses its drive letters and I have to keep manually assigning a drive letter everytime I plug in a hard drive, whether it's internal or external. The only way to get around it is to reinstall Windows 7 but the problem will come back after a few months. We are a PC repair company and plug in many drives during the say and it can be very frustrating having to keep assigning a drive letter every time a drive is plugged in. Windows Updates are turned off so it can't be that. Any reason why this would have happened?

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• How can I switch Linux running OS from disk to running from RAM without restarting?

  - by vfclists

  Is it possible to switch to running Linux from RAM or RAM disk after starting starting initially from disk? eg. You need to make an image of your hard disk, FTP it to a remote location, some time later you want the image back, so you start the system from disk as usual, restore the image you FTP'd from the remote location back into place. More like a CloneZilla backup and restore, without booting the server from CD or USB disk, but starting from the normal hard disk? Notes on environment I should have mentioned it earlier. It is a remotely hosted VM where I cannot boot into a recovery console mode or do a netinstall. It will always boot onto the same disk. Which means that if there is some serious corruption I can't repair it offline, which is why being able to ftp a previously saved backup into place is so important

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• Nginx save file to local disk

  - by Dean Chen

  My case is: In our China company, we have to access one web server in USA headquarter through Internet. But network is too slow, and we download many big image files. All our developers have to wait. So we want to setup a Nginx which acts as reverse proxy, its upstream is our USA web server. Question is can we make Nginx save the image files from USA web server into its local disk? I mean let Nginx act as one cache server.

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• how to change the default open-with program to a program on the second disk

  - by Scott????

  I have a 250GB HDD for my system and a 60GB SSD using a SATA port. I installed most of my applications on the SSD. There's a strange thing though. I can not change the default open-with program to a program which is on the SSD. I think it may be caused by permission so I gave my user a 'full control' permission on the security tab in disk properties. But changing permissions is not work. After I choose an application (I've tried Notepad++, Sublime, 7Zip, etc.), nothing is added in the below window: Also, if I install 7Zip on my machine, the right click menu items can not be added.

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• Data transfer speed to USB storage connected to wifi router very slow

  - by RonakG

  Here is my setup. A Linksys Cisco E3200 wifi router. A MacbookPro running OS X Lion 10.7.4. A Seagate GoFlex 1TB hard drive connected to wifi router via the USB port. When I try to transfer data from my MBP to the HDD, the data transfer rate is very low. I'm getting around 3MB/s write speed. This is very slow compared to the speed I get when HDD is directly connected to the MBP. The HDD is NTFS formatted. And the router provides access to HDD using Samba share. So I connect to the HDD using smb://. What is the limiting factor here affecting the data transfer rate?

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• Having problems with Grub2 booting Ubuntu from my External Hard Drive

  - by anonymous

  I installed Ubuntu on my external hard drive but it won't boot on my laptop. what do i do? i did some reading and traced the source of the problem to grub2. Apparently, grub2 doesn't use the device's UUID, and uses the linux directory instead (/dev/sdf2). This means that whenever i plug my E-HDD into a system that has a different number of drives connected to it, i won't be able to boot without editting the boot command. I don't understand it too well but that's what i got from what i read. Is there anyway to fix this?

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• Why does HDTune report better performing drives 2 months after installing them?

  - by Rolnik

  OK, so this is really weird. I ran HDTune on a newly set-up home-built computer and got the following readings from my drives in mid-November. SSD 154 MB/s RAID1 87 RAID0 198 (software installs) RAID0 98 Swap drive Today, in January, I run HDTune (same version) and get these results, in MB/s: SSD 186 RAID1 98 RAID0 241 RAID0 98 (Swap drive) Here are more details that HDTune reports on the SSD drive: HD Tune: OCZ-VERTEX Benchmark Blockquote Transfer Rate Minimum : 135.4 MB/sec Transfer Rate Maximum : 219.4 MB/sec Transfer Rate Average : 185.7 MB/sec Access Time : 0.1 ms Burst Rate : 187.3 MB/sec CPU Usage : -1.0% To get to my question: Why are my hard drives improving in performance? Most of my logical drives are in some form of RAID, except for the SSD. Will this performance ever deteriorate? Note, none of my drives are a hybrid drive that uses some form of SSD to enhance the write/reads on actual platters.

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• Computer temporarily freezes and then resumes

  - by trizicus

  This happens on ALL operating systems (7, Ubuntu, etc.). What happens is everything for 1-3 seconds becomes unresponsive, I then hear what sounds like my other internal hard drive 'spinning up', and then viola everything is responsive again. Note: Already ran SMART tests, no issues at all. I think issue is that the HDD spins down and when need it gets 'turned-on' (OS settings turn off HDD's after 20 mins of inactivity) and because my pagefile is on the other HDD it causes OS to temporarily freeze. Need more tips, and insight. Thanks More info: Running Quad CPU, 4GB RAM, Intel SSD, GT 240.

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• Word 2007 "Out of Memory or Disk Space" Error on launch

  - by Adam

  Word 2007 is installed on a Vista Home Premium machine and whenever it starts up it opens what appears to be a dynamic installer to do something and then throws up the "Out of Memory or Disk Space" error. Word 2007 never completes starting up. Reinstalling Word hasn't helped and if I can avoid reinstalling Windows until Windows 7 is released and get Word working in the mean time, that would be ideal. I've been looking around for a solution, once of which seemed to point to a problem with the user account. I created a second user on the machine and Word still had the same problem. The other solution that seems possible is a corrupted normal.dot/normal.dotm file. However, even in the location it should be, I can't seem to find it. Am I going in the right direction with this? Is there another solution I haven't come across that will fix this? If it is possible that renaming normal.dot/normal.dotm how can I find it?

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• Drive stopped working on windows server 2003 and I receive a "controller error"

  - by Durden81

  I can access the server in safe mode. I have a Proliant 360 Hp server with Windows server 2003 R2. The event viewer is completely filled up with this error: the driver detected a controller error on Device\Harddisk3\DR3 I individuated the drive affected. It is drive H that is a secondary non mirrored drive. When I access anything on that drive I receive: "the request could not be performed because of an I/O device error" What should I do? Is this just a driver issue or a hard drive failure? Please give me a quick help as my websites are offline due to this. Any suggestion is welcome!

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• 2010 MBP HD speed sanity check?

  - by hvgotcodes

  I have a 2010 MBP with the 7200 rpm hard drive. I was copying a 2.1GB file, and noticed read/write speeds of around 20MB/s. Is that reasonable? Seems slow to me.... What is the proper way to benchmark a HD on OS X? Googling I see xbench, but that hasn't been updated in years. I also see some guides for using the command line. The goal would be to benchmark my drive and then compare the results to some official scores that the drive should be getting.

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• Accidentally deleted the software for MyPassport Essential SE 1TB Hardrive

  - by user26192

  I'm posting for a friend of mine. She bought a WD MyPassport Essential SE 1 TB Hard drive the other day. When she plugged in the USB in her lap top, the driver cannot be recognized by the smart ware software. While she was doing a back up of her files, McAfee was running in the background. Since the backup was taking so long to finish, she decided to pause it. She tried to delete the partially backed up files, but instead, she accidentally deleted the entire file in the folder including the pre-installed software. Now, when she tries to start up the MyPassport, the smart ware doesn't show up anymore. Can someone please give us advice what can she do about this? Thank you.

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• How to find what is written to filesystem under linux

  - by bardiir

  How can i find out what processes write to a specific disc over time? In my particular case I got a little homeserver running 24/7 and I included a script in the crontab to shutdown all drives that are not used (no change in /proc/diskstats for 15 minutes). But my system disc won't come down at all. I'm suspecting logs but it's probably not only logs writing to the filesystem on the system disk and I don't want to go all the way moving the logfiles to something else just to find out the disc still doesn't spin down and there's nothing i can do against it.

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• Issue with broken disk on Solaris with raidctl - how to proceed

  - by weismat

  I have a SunFire T2000 server which has 2 mirrored disks pairs. The server required an exchange of the system battery. After swaping the battery first no disks were found. After booting from CD we managed to find the disks, but now one disk is broken and the raidctl reports a failed synchronisation. The boot process stops now when trying to mount the file systems. The power light of the broken drive is not even blinking. What is the best way to proceed now ? Fortunately I could live with loosing the data on the drive as it is backed up, but I would like to keep the rest of the data as it contains /etc and get the server booting again.

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• Installing CentOS 6.3 wrong hard drives order?

  - by Ken Tang

  I am trying to install CentOS 6.3 on new server that has 2xSSD and 1xHDD drives connected to mainboard's SATA ports by following order: SSD1 -> SATA1 SSD2 -> SATA2 HDD1 -> SATA3 On the installation process CentOS shows me hard drives by this order: /sda -> that is actually SSD2 /sdb -> HDD1 /sdc -> SSD1 It looks like CentOS assigns it randomly rather by the SATA connection order. My question is: What the order of drives /sd* depending on? And how can I change it to be by the order it connected to SATA? Thank you in advance!

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• Use Windows 7 offline sync with external usb hd

  - by René

  Yeah, truly the whole question in the header. Is there a way to use Windows 7 offline sync (which we know from network mapped drives) with a external usb hd? When not, are there similar built in tools or good third party tools? My scenario: I want to buy a ultrabook with SSD which is mostly limited in space. So I'm going to put all files to a external HD and only store current projects on the local SSD. Let's say I have to change project. It would be easy just change sync folders and have the second project synced to my hd too. With network mapped drives it's such easy. Paths do not differ if the drive is offline so in most situations you don't take notice if the folder is offline. And you only have to activate offline file for the folders you courrently need for work. So is there a similar solution for usb hard drives?

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• Creating disk snapshots in Windows 7

  - by Puneet Arora

  Does anyone know of a command or tool to create disk snapshots on Windows 7 (client SKU)? I see vssadmin.exe has a "create shadow" option, but that's available only on server SKUs: http://technet.microsoft.com/en-us/library/cc788055(v=ws.10).aspx I've a backup tool that replicates changes (creations, modifications and deletions to files and directories) since last backup, to my backup volume. Before each time this happens I want to create a persistent snapshot on my backup volume. I could then mount previous snapshots to view previous backups achieving a behavior similar to that of TimeMachine in OS X. This question has been asked before but unfortunately there weren't any good answers: Taking snapshots of filesystem/volume in Windows 7?

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