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TOPIC: Drive Scope use with external drives

Drive Scope use with external drives 28 Aug 2017 18:27 #8508

I purchased Drive Scope and I am trying to get it to read my external usb and firewire drives. I am using os 10.11 El Capitan. I have attempted to use the website in the manual to install driver for that purpose, but I am confused by the website as to which driver to download and how to install it. I have downloaded a driver but cannot achieve any reading of external drives. Does Micromat plan on any updates to simplify this process and allow use of new Drive Scope by us non-techs?
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Drive Scope use with external drives 28 Aug 2017 18:58 #8509

As the Drive Scope manual suggests, if one of the drivers does not work, try a different one. None of my external G-Technology drives provide SMART data with any of the drivers.

The page at <<github.com/kasbert/OS-X-SAT-SMART-Driver>> has instructions for both installing and removing the drivers. The commands given for removal should be run in Terminal, located in /Applications/Utilities:

Install
=======

* Unmount external drives
* Use the dmg image and the installer
* Check DiskUtility. The disks should have "S.M.A.R.T. Status: Verified"


Uninstall
=========

* Remove driver and plugin
sudo rm -r /System/Library/Extensions/SATSMARTDriver.kext
sudo rm -r /System/Library/Extensions/SATSMARTLib.plugin
sudo rm -r /Library/Extensions/SATSMARTDriver.kext
sudo rm -r /Library/Extensions/SATSMARTLib.plugin
* Reboot


There is a list of supported drives linked on the same page. It is important to note the requirements for the drive:

OS X SAT SMART Driver
#####################

This is a kernel driver for Mac OS X external USB or FireWire drives.
It extends the standard driver behaviour by providing access to drive
SMART data. The interface to SMART data is same as with ATA family
driver, so most existing applications should work.

The driver requires a SAT (SCSI ATA Translation) capable external
drive enclosure. Check smartmontools list for supported devices:
smartmontools.org/wiki/Supported_USB-Devices
If the Option column contains sat or jmicron, the driver should work.
The driver should work with Snow Leopard and Lion and Mountain Lion.
People have reported problems with Lion and Encrypted volumes.
Some enclosures are reported to work with FireWire but not with USB.
The driver is not compatible to WD Drive Manager, or enclosures
with custom kernel extensions.
MicroMat Inc
Makers of TechTool
Last Edit: 01 Sep 2017 03:19 by micromattech3.
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Drive Scope use with external drives 29 Aug 2017 00:07 #8522

A future update to Drive Scope will have an installer and remover for the driver in one of the menus.
MicroMat Inc
Makers of TechTool
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Drive Scope use with external drives 29 Aug 2017 00:14 #8523

If a driver does not work with a FireWire connection, reboot and connect with USB. If that works, then the drive may work later with a FireWire connection.
MicroMat Inc
Makers of TechTool
Last Edit: 29 Aug 2017 00:14 by micromattech3.
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Drive Scope use with external drives 31 Aug 2017 22:55 #8529

Thursday, August 31, 2017

Drive Scope 1.0.2 Release Notes

New features in the SMART 1.0.2 update include:

• Added option to install code signed SAT SMART Driver, enabling support for SMART-supported external USB and FireWire drives.
• Fix for ‘Time to Complete’ field being editable in the Self-Test category.
• Fixed Drive Scope Uninstaller application for OS X 10.9.5 or earlier users.
• Updates to the Drive Scope PDF manual.
• Other improvements and enhancements.
MicroMat Inc
Makers of TechTool
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Drive Scope use with external drives 22 Dec 2017 00:16 #9121

I have Drive Scope version 1.1.2 ( build 413 ) and it only reads ( sees ) my iMac showing it to be disk0. Doctor Drive Scope reports the said computer's health with a green dot passed.

What about the external 2 Firewire drives and 4 USB's drives ?

Why do they not show up in the device panel on the left hand side ?

or, How do i get Drive Scope to see/read those external drives ?

If that information is covered in the manual then i sure missed it or misunderstood the explanation ( s ) about external drives.

Thank you for your review of this posting and your pending clarification.
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Drive Scope use with external drives 22 Dec 2017 00:34 #9122

Walter,

The topic is covered in the manual, but I have to give you high marks even for mentioning reading a manual.

There is quite a bit of material about this topic, starting on page 45 of the manual. It is also mentioned in the introductory material. I will quote just the first part here. The rest is not copying very well, because of the formatting of the manual. Please be sure to read page 45 and beyond. It may seem complicated at first, but it is really not. Some drives are supported by an open-source kernel extension that allows reading SMART data from USB and FireWire drives, and some are not.

From page 45 of the DriveScope 1.1.2 manual:

1. Can Drive Scope check the SMART information of my external USB and Firewire devices?

Reading SMART attributes from external drives connected via USB or Firewire requires that you install the SAT SMART Driver so that your Mac can ‘see’ the SMART data on the external drive. The SAT SMART Driver is a kernel extension which extends the operating systems ability to access the SMART data of an external USB or FireWire hard drive.

Install the SAT SMART driver using the Install SAT SMART driver menu item in the Drive Scope menu. For Macs running 10.8 visit on the link below:
github.com/kasbert/OS-X-SAT-SMART- Driver

This material is followed by instructions for High Sierra. You may need to restart after installing the kernel extension.
MicroMat Inc
Makers of TechTool
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Drive Scope use with external drives 22 Dec 2017 03:04 #9123

Thank you MR. micromattech3.

How do i rectify this problem ( as per the 2 screen shots ) ?

I used DiskUtility First Aid with no change in the health of that 1 TB drive that is partitioned into 2 nearly equal segments.
Attachments:
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Drive Scope use with external drives 22 Dec 2017 11:22 #9128

Walter,

You are welcome.

I think the best thing to do is to contact the maker of the drive mechanism, and show them the data. There are cases in which the data is difficult to interpret for SSD drives, because they are interpreting normal wear-leveling as reallocation.

There is nothing a utility can do to remedy blocks that the drive determined to be defective and remapped to spare blocks. The number of spare blocks is limited.

Here is what the Drive Scope 1.1.2 manual says about SMART attribute 5, on page 22:

Attribute 5 - Reallocated/Retired Block Count
Critical Attribute

Reallocated Sector Count is the total number of reallocated (or retired) blocks since manufacturing. This SMART attribute is also known as the grown defect count.

The raw value of this SMART health indicator represents the number of blocks that have been moved as a result of a read error, write error, or a verification error. If the firmware of the device detects any of these types of errors, all valid data on the block the data originates from must be transferred to a new, unoccupied block. The normalized equation for this health indicator decrements as blocks are reallocated (or retired) and the reserve (over-provi- sioned) block count is decremented.

Even though this health indicator is not as critical for Solid State Drives (SSD) as for Hard Disk Drives (HDD), an increase in the count of reallocated (or retired) blocks reduces available reserved space and SSD lifetime. Moreover, this number should be low because a high number would indicate a large number of failures for this SMART attribute. A large number of reallocated (or retired) blocks is a sign of serious internal defects and problems with an SSD. If the number remains the same and is not large, then concern is not warranted. However, if the number is increasing over time, this could indicate problems with the drive, and the drive manufacturer should be contacted.
MicroMat Inc
Makers of TechTool
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The following user(s) said Thank You: Walter

Drive Scope use with external drives 23 Dec 2017 16:15 #9137

Once again, thank you for you time and patience with me and providing me with your expertise knowledge.

As you suggested i will contact the makers of this USB drive.

Now here is the " however " part.

Do you think that the said problem with that USB drive may be the fact that I split the drive into 2 equal ( nearly equal ) parts ?

One drive has Yosemite and the other Snow Leopard.

I could restore the drive back to its original size being 1 TB.

I am thinking that if i bring the problem to the Verbatim they will say that the drive as a 1 TB USB is perfect it is only because i split the drive that Drive Scope is giving me that error report.

What say ?
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Drive Scope use with external drives 23 Dec 2017 16:39 #9138

Walter,

You are welcome.

The remapping of bad blocks (or memory cells) to spare blocks (or memory cells), which is what caused the reallocated sectors count to go up, is an irreversible event that has nothing to do with the fact that the drive is partitioned into multiple volumes.

The SMART test is looking at data the drive or device recorded in its own firmware. It does not look at volumes. The results are not in any way affected by the type of partition map on the drive or device, or the types of volumes, or whether the data on them is correctly recorded in the disk directory, or whether the data is corrupted.
MicroMat Inc
Makers of TechTool
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Drive Scope use with external drives 23 Dec 2017 16:44 #9139

Walter,

If this USB drive is being used as a backup, you should be planning to make another backup. It is possible that if enough bad memory cells are remapped to spare memory cells, the drive will run out of spares, at which point its firmware may turn it into a read-only device.
MicroMat Inc
Makers of TechTool
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