Mac Invalid Checksum Dmg Files

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Mac users can use the built-in Terminal app to check a file’s checksum which means no third-party app download is required. Once it shows you the checksum for your file, you can then go ahead and compare it with the one that the source website has given you to find out if it was modified or corrupted in the process. Invalid checksum says, that there is something wrong either on your disk or on the download. The wrong disk could explain the install problems also.

Download Mac OS X El Capitan 10.11.1 DMG free latest standalone offline setup. The Mac OS X El Capitan 10.11.1 DMG is the twelfth major release of OS X providing different enhancements and many new features.

Mac OS X El Capitan 10.11.1 DMG Review

Among different Mac OS X releases, El Capitan 10.11 is known as a prominent release now known as macOS El Capitan providing numerous enhancements and a wide range of powerful features. It provides a sleeker user interface with an eye-catching environment; the users can find everything with the glimpse of an eye. This release basically focusses on the compatibility, security and the stability. There is a bundle of fixes that improve the performance and the reliability of the OS.

Numerous updates and enhancements make it even more stable environment than other previous OS X releases. Various new updated components and enhancements for mailboxes in Mail, various issue fixes and a bundle of compatibility enhancements are there for the ease of the users. It provides better compatibility for Microsoft Office 2016 as well as over 150 new emoji characters are added. All in all, it is a stable Mac OS X release providing a bundle of enhancements and issue fixes.

Features of Mac OS X El Capitan 10.11.1

  • Focusses on stability, reliability, compatibility, and security of MAC
  • Various updating components, issue fixes, and feature enhancements
  • Addresses an issue with the mailboxes in Mail
  • Provides better compatibility with Microsoft Office 2016
  • Enhancements for different audio plugins and VoiceOver reliability
  • Various enhancements for Maps, Safari, and Notes etc.
  • Over 150 emoji characters are added

Technical Details of Mac OS X El Capitan 10.11.1 DMG

  • File Name: Install_OS_X_El_Capitan.app.dmg
  • File Size: 5.6 GB
  • Developer: Apple

System Requirements for Mac OS X El Capitan 10.11.1 DMG

  • 10 GB free HDD
  • 4 GB RAM
  • Intel Multi-Core Processor

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Malware is becoming more and more common for macOS. I wanted to make sure file I downloaded files such as an ISO image or firmware are safe before install on my system. How do I verify md5 or sha1 or sha256 checksums for my Apple MacOS X when I download files from the Internet?
Matching the checksum of a download file is necessary and useful in some cases. The main reason is to make sure that one can validate the transmission was ok. The downloaded file was not corrupted or modified during the transfer. You need to use the shasum command to compute or verify SHA message digests.
A checksum is nothing but a digit representing the sum of the correct digits in a piece of stored or transmitted digital data, against which later comparisons can be made to detect errors in the data.
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Syntax to check and verify md5/sha1/sha256 checksums for MacOS X

To print or check SHA checksums use the following syntax:
shasum -a algorithm filename
shasum -a algorithm -c input.txt
Where,

  1. -a algorithm : It can be 1 (default), 224, 256, 384, and 512.
  2. -c input.txt : Check SHA sums against given list usually stored in a text file.

Examples

Open the Terminal application and grab the latest firmware using wget command:
$ wget http://www.mediafire.com/file/ff04qcobujqek27/RT-AC87U_380.66_6.zip
Verify the file:
$ ls -lh RT-AC87U_380.66_6.zip
Unzip the file using unzip command:
$ unzip RT-AC87U_380.66_6.zip
Sample outputs:

Your firmware file named RT-AC87U_380.66_6.trx. You can verify its integrity with sha256sum.sha256 file as follows:
$ shasum -a 256 -c sha256sum.sha256
Sample outputs:

If file is modified during transmission or by malware on the remote server you will get an error that read as follows:
$ shasum -a 256 -c sha256sum.sha256
Sample outputs:

You must delete the file immediately using the rm command:
$ rm RT-AC87U_380.66_6.zip RT-AC87U_380.66_6.trx
To calculate SHA-256 checksum for an iso file named foo.iso, run:
$ shasum -a 256 foo.iso

Verifying an SHA-1 checksum

The syntax is:
$ shasum -a 1 -c input.txt
OR
$ shasum -a 1 filename
OR
$ shasum -a 1 centos.iso
To see more info about the shasum command type:
$ shasum --help
Sample outputs:

Another option: openssl command

You can use the openssl command as follows to get and verify checksum.

Verifying an SHA-1 checksum with the openssl command

$ openssl sha1 filename
$ openssl sha1 ~/isoimages/unetbootin-mac-625.dmg
SHA1(/Users/veryv/isoimages/unetbootin-mac-625.dmg)= 8a44b5095ed9b05f8a2643a5df91e932467a0e7

Verifying an SHA256 checksum with the openssl command

$ openssl dgst -sha256 filename
$ openssl dgst -sha256 ~/isoimages/CentOS-7-x86_64-Minimal-1611.iso
SHA256(/Users/veryv/isoimages/CentOS-7-x86_64-Minimal-1611.iso)= 27bd866242ee058b7a5754e83d8ee8403e216b93d130d800852a96f41c34d86a

Verifying an MD5 checksum with the openssl command

$ openssl md5 filename
$ openssl md5 /etc/passwd
MD5(/etc/passwd)= 5e7f80888f3d491c4963881364048c24

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