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• Booting ubuntu from usb hdd: GRUB menu not shown

  - by emanemos

  Hello, could anyone help me to boot ubuntu-9.04 from usb hard disk? This disk contains /boot primary partition. During ubuntu installation I used "Advanced" button and asked to install GRUB to the /boot partition. Later I checked whether GRUB files are really present in this partition. They are. However, I get stuck while trying to boot. The boot menu ("ubuntu generic version", "ubuntu recovery mode", etc...) is not shown. Instead I am thrown to GRUB minimal bash-like version. I feel at a loss and have no idea why I am pointed to this minimal version. Can anybody prompt me what to do?

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• System reserved

  - by arun sidharth

  I have a HP laptop. I upgraded to windows 7 ultimate from home basic. Now I'm trying to upgrade to Windows 8 but when I do I get a message saying not enough system partition. So I opened the disk manager and increased the size of system reserved partition and it was of no use I still got the same error. Then I unfortunately deleted the 100MB system reserved partition by right clicking it and clicking format in the disk manager! Now I am not able to boot any CD's from the startup including OS and recovery CD. Whenever I press esc it always goes to the login screen and it doesn't say anything about the boot from CD option. Now I could not even use my recovery CD. I have 3 questions: Is it necesseary to create a system reserved partition if so how to create it? How to use my recovery cd How to install win 8

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• dd cloned win2003 std ntfs partition, "no operating system found".

  - by 3molo

  I cloned an existing ntfs partition on faulty hardware using dd and gzip. The copied partition was then written to a newly created ntfs partition on a new disk (on another server) and the bootable flag was set. However, the "Operating system not found" (or is it No operating system found?) is what happens when I try to boot it.The faulty server is part of the AD domain, but I do not have the local administrator password, so I couldn't use the repair console of windows 2003 to fixmbr. I did try to do a normal repair during win2003 installation menu, but with no success. Both windows installation and Linux recognizes it as a ntfs partition of its true size, and files can be seen and read. I've done this a couple of times before, but I didn't encounter this problem. Of course I encountered other problems, like BSDO due to lack of hw drivers etc - but that was pretty easily fixed. Why am I failing to get the copied partition to even be recognized as a bootable disk on the new server?

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• Server OS: put it on a separate drive? Yes, no, or depends on the situation?

  - by captainentropy

  Hi, I would like opinions, or facts, both preferably, on whether it's ok to install a server's OS on the RAID array or not. I would predict installation on separate drives is the best but I'm interested in the performance. The server in question will have 8 cores (2.4GHz ea.), 24GB RAM, and ~16TB of usable space of server-class drives in RAID10. There is also a subsytem of an ~equivalent size for backup. I will be running CPU/memory intesive applications on this server in addition to it being file storage for my work (research lab). IF I install the OS (haven't decided which one, probably Ubuntu or Fedora or some other good linux distro) on separate drives will there be any performance problems if they aren't configured in RAID10? IF it is better to have the OS on separate drives should I go for 150GB velociraptors in RAID1 or smallish SSD drives in RAID1? Money is unfortunately a factor as I think I'm close to maxing my budget as it is. Thanks!

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• How to troubleshoot if a zip file is valid or if it is big file size to be unzipped ?

  - by mireille raad

  Hello , I am trying to unzip a file with the size of 2GB I am getting the following error : unzip CLTE_C_08.zip Archive: CLTE_C_08.zip End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. unzip: cannot find zipfile directory in one of CLTE_C_08.zip or CLTE_C_08.zip.zip, and cannot find CLTE_C_08.zip.ZIP, period. After some googling, some people say that this error is because the file is too big, others say because file is corrupt, others say that it could be a not unix archive. So my question , how to find out if file is valid archive file on my Centos and what is the command/trick to uncompress big files ( if any ) Thanks in advance :)

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• Why obfuscating a serial number of a device? What is the risk?

  - by Horst Walter

  In one of my xx.stackexchange questions I've got an answer, in which the user has obfuscated his disk's SN (serial number). Recently I have seen this in several photos as well, the SN was blurred out. I' am just curious, because I have never paid attention to this. What could be the potential risk in publishing a device's SN? I do see some sense when it comes to a MAC address, OK, this could be used for tracking. But a SN of a disk, iPad, whatsoever? Maybe there is an important reason for not publishing it, which I haven't seen so far.

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• Recover Bios HP DV9700T windows 7 64

  - by petebob796

  I downloaded the latest DV9700t bios (.59) and ran the update tool in windows 7 64. This seemed to go ok and did the usual system will shutdown in 10 seconds dialog. Updon the reboot nothing happens I get no BIOS screen or anything so I think the bios update went wrong. Which I am annoyed about I have never known a bios update to fail before and lots of people on the internet seem to have had the same problem with the same model. There is a way to recover apparently using crisdisk utility and creating a bootable usb key then holding win+b at power on, unfortunately the utility to make the disk doesn't seem to work in 64 bit versions of windows, the only type I have easy access to. Anyone know a way to create the boot disk in 64?

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• cdrom drive doesn't work on laptop

  - by bozdoz

  Here's as best as I can describe it: When starting up, the boot order doesn't recognize the cdrom drive, but I can open and close the drive during this time. In Windows 7, I can't open the cdrom drive, and it doesn't recognize it in device manager, disk management, or my computer. In Ubuntu Linux, I can open the cdrom drive, but it still doesn't recognize the cds, and it won't mount. If I reformat everything, would my cdrom drive work again? Can I reinstall Windows without a cdrom drive? I've deleted the upper and lower filters as was suggested in Google searches. Took the disk drive out and checked that it was installed correctly (no reason it shouldn't have been). Still: nothing works.

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• Does OEM partition stores Windows 7 serial key ?

  - by Mahesha999

  Does OEM partition stores the serial key which is grabbed by the Win 7 setup done from the disk provided with laptop. I realized that when you install clean system from Windows 7 disk you get with laptop, it grabs the serial key or it doesn't ask one. So from where it gets that serial key. Is it the OEM partition or anything else? Or the recovery partition stores the key? What all the things these two partitions do store in them?

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• Keyboard not responding during boot

  - by Peri

  My keyboard just stopped responding during boot. So I cannot go to BIOS or select system which I want to start. It is USB keyboard and it was working before. I borrowed PS2 keyboard and it also isn't working during boot. Lately I have been having problems with hard disk. Once every 2-5 minutes LED was on for 30 seconds and win7 wasn't responsive. I connected disk to another controller on motherboard and seems it is working now. All that suggests that to me that that motherboard is broken. What can I check? Or maybe you have some other suggestions?

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• how to clone a physical "individual partition" vmdk into a "local" (file-based) vmdk?

  - by BJH

  Hello. I have a physical disk with a small (60GB) partition containing my guest OS. The physical disk also contains a large (240GB) block of unpartitioned space. My vmdk is defined as a physical "individual partition". I want to convert the source physical "individual partition" vmdk into a local (file-based) vmdk. The command - vmware-vdiskmanager -r sourcevmdk targetvmdk -t 2 creates a 300GB vmdk that includes both the desired 60GB "individual partition" and the 240GB of useless unpartitioned space ! How can I create a local vmdk with just the individual partition?

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• Revert a VM client from within the VM Client - is it possible?

  - by Saariko

  I am creating a test VM client for our QA department. Once it's installed, my options will be: Use a snapshot Use non persistent disk on the hard disk. For either options, I can give the role of QA_DEP the ability to log to vCenter and go back/power-off the client - so they can return to their clean machine. My question: is it possible to have that ability without using vCenter? What If I want that on a Client reboot - it will return to it's initial/clean state? The clients are not gonna be heavy loaded.

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• TrueCrypt with blank password

  - by TheSavo

  This might sound like an odd question, but please hear me out. I want to setup my laptop to use TrueCrypt, but without a password. My wife doesn't travel much with her notebook. There are occasions where we will have to travel and bring the notebook with us. This is when we would like the have the encryption. The time it takes to to change the unlock pass-phrase is considerably less than it takes to encrypt the drive. My thoughts are to leave the disk encrypted but with no password. Then when it's time to pack for a trip and bring the laptop, we would then change the pass-phrase and create a rescue disk.

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• Super slow time machine backup on my mac

  - by lowellk

  I just got a new 2TB drive which I'm trying to use as a time machine drive for my mac which has a 1TB drive. On my first time trying to back it up, I'm getting terrible throughput, not even 1GB per day (it's been running for 36 hours now). I erased the disk and tried to copy a large file to it and got the same slow speed. What can I do to diagnose this? Are there any tools which can inspect the disk and tell me if it's messed up? Thanks!

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• Samba / smbd on Centos 6.5

  - by Satalink

  I've installed Samba4 and have the smb.conf file as follows: [global] workgroup = WORKGROUP server string = Samba Server realm = REXIALO.COM netbios name = REXIALO.COM security = user map to guest = Bad Password bind interfaces only = no interfaces = lo venet0 log file = /var/log/samba/samba.log max log size = 1000 [webroot] path = /usr/local/apache/htdocs comment = Example.com webroot directory read only = No I can connect from the same server with smbclient. Localhost: # smbclient -L localhost -U root Domain=[WORKGROUP] OS=[Unix] Server=[Samba 4.1.11] Sharename Type Comment --------- ---- ------- webroot Disk RexiAlo webroot directory IPC$ IPC IPC Service (RexiAlo Samba Server) Domain=[WORKGROUP] OS=[Unix] Server=[Samba 4.1.11] Server Comment --------- ------- Workgroup Master --------- -------Enter root's password: network: # smbclient -L rexialo.com -U Domain=[WORKGROUP] OS=[Unix] Server=[Samba 4.1.11] Sharename Type Comment --------- ---- ------- webroot Disk RexiAlo webroot directory IPC$ IPC IPC Service (RexiAlo Samba Server) Domain=[WORKGROUP] OS=[Unix] Server=[Samba 4.1.11] Server Comment --------- ------- Workgroup Master --------- ------- The problem is when I try to map to the smb webroot from Windows 7, it asks for user/pass but just times out and then prompts for credentials. The samba.log file does not show any activity other than the startup of the smbd process. Any help would be appreciated.

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• It's the ethernet 10/100 in LAN transfer faster than USB 1.0?

  - by dag729

  I have an old laptop (PIII 800MHz, with 256 RAM) that I wish to use as my home server: it'll have to serve just two people, so I think that I'll be more than ok as for the RAM and the CPU. The issue is about data, because the internal hard disk is a 12GB, that is...ridicolous! I have more than 60GB of mixed storage and counting (images, videos and music) in an external usb hd. I could put the hd in my desktop pc just to serve the big files through ethernet or let it inside its usb box attached to the laptop. The question is: which of these solutions will be the fastest? USB 1.0 attached to the server (laptop) or internal hard disk serving files via 10/100 ethernet to the laptop on demand?

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• Network Monitoring Tool Recommendation

  - by user42801

  Hello, My company is looking for a monitoring app/tool that would allow us to capture and graph statistics on network performance. As a starting point, we would like to ping remote host(s) and gateway(s) from several of our servers, grab an average of the ping times from each of our servers to the remote host(s), and then graph it (preferably in a central location). Also, we would like to be able to graph the results for time frames as short as a week to as long as 6 months. It is reasonable to expect that we would ask more of the selected monitoring app/tool as we come up with other key network performance indicators in the future. So an app with great flexibility and features would be ideal. Upon first glance, Cacti looks like it might be a fit. Any other recommendations? Thanks in advance for any input.

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• Which SSL certificate to buy [closed]

  - by Sparsh Gupta

  I am reading several notes on SSL certificates and comparison. What matters to me the most is speed. I can read that encryption is same with all different certificates available but I was wondering if there is any difference in the performance of the website with different certificates involved. I am ofcourse interested in end to end response times and I wonder if the type of encryption or number of certificates required as Chain Certificates makes a difference in speed. I dont really care for cost but looking for a good SSL certificate which ideally gives me absolutely no pain and best performance. Recommendations?

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• repair/recovery tool for Western Digital Elements (1TB)

  - by Pennf0lio

  My Hard Disk Drive just got corrupted due to electricity fluctuation. When I plug my Western Digital Elements, It ask me if I want to format it or not... I can't see my files or even the capacity of my disk from it's properties. Is there any solution you would suggest? looking for a software that can give me access to my files. I just need to copy it then I can retire my Drive and will buy a new one... Thanks!

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• VirtualBox: Grub sees hard drive, Linux does not

  - by thabubble

  I installed Linux on my second hard drive. I can boot to it just fine. But when I try to boot it from a Windows 7 host using http://www.virtualbox.org/manual/ch09.html#rawdisk, grub sees it and can load vmlinuz and initramfs. Log: :: running early hook [udev] :: running hook [udev] :: Triggering uevents... :: running hook [plymouth] :: Loading plymouth...done. ... Waiting 10 seconds for device /dev/disk/by-uuid/{root UUID} ... ERROR: device 'UUID={root UUID}' not found. Skipping fsck. ERROR: Unable to find root device 'UUID={root UUID}' It then drops me into a recovery shell. I checked "/etc/fstab" and it's empty, there are also no sd* devices in dev, the only thing in /dev/disk/by-id is a VBox CD device. I'm not too good with these kinds of things so help would be greatly appriciated.

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• Installing Solaris 10 on sunT5220 - ZFS/UFS raid 10?

  - by Matthew

  I am in a bit of a time crunch, and need to get two T5220's built. We were very happy to see two boxes in our aged inventory which had 8 HDD's each, but didn't think to check if they were running hardware RAID or not. Turns out that they aren't. When we install, we are given the option to use UFS or ZFS, but when we select a place to install we're only given the option of installing on one single disk. Is it possible to create a software raid 10 across all of the disks and install the OS on that? Sorry if any lingo is wrong, I'm not really a Sun guy and our guru is out of town right now. Any help would be really appreciated! Note: Most of the guides I've found on google entail installing the OS on a single disk, and then creating a separate RAID 10 on other disks. We would actually like the OS to reside on the RAID 10. Hope that clarifies things.

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• Robocopy to copy only new folders and files

  - by Valery Shampal

  A task: To find all new files and subfolders under some root folder (let us say Documents) and to copy them to other disk (j: in this case) Command line used: robocopy c:\users\valery\documents j:\robocopy /XO /E /MAXAGE:20131030 /XD Result: A full folders tree created. Only new files copyed, as supposed. It's good A point is, that I do not want to create all subfolders on a target disk, if there are no new files in them. Results are exeptable, but there is a lot of work to go through all folders and to find new files, as well, as to understand, what subfolders are a new ones Regards, Valery

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• Deleted All Snapshots, Now Won't Boot VM with Snapshot not found error

  - by Jharwood

  I've just tried deleting the snapshots from this virtual machine running ESXI5, so that I can grow the Thick Partition. I've now got the below error message when I try to start the VM, the VM also can't be grown above 0 MB i assume for the same reason as below. I've checked the datastore and the original VMDK is still there. Reason: The system cannot find the file specified. Cannot open the disk 'VM1-PG-000002.vmdk' or one of the snapshot disks it depends on. VMware ESX cannot find the virtual disk "VM1-PG-000002.vmdk". Verify the path is valid and try again. How do i tell ESXI5 to use the proper VMDK?

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• what is the best wireless router?

  - by sam

  what is the best wireless router out there? performance compatibility

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• Is it safe to compress my Windows 7 %USERPROFILE%\AppData folder?

  - by Kev

  Having just read Scott Hanselman's latest blog entry, Guide to Freeing up Disk Space under Windows 7, he suggests turning on NTFS compression which I already do for a number of less travelled folders that contain static files such as downloads or images. However I am wondering if it's wise to turn on NTFS compression for the whole of my %USERPROFILE%\AppData folder? My system drive is a 128 GB SSD residing in a Dell Precision T5400 3Ghz Quad Core Xeon workstation so I ought not to notice the extra cycles used to compress and decompress files on their way to and from the disk. However would there be any good reasons not to do this? In fact could I safely compress the whole of my %USERPROFILE% folder?

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