macOS Why can't I find 'load cycle count' for MyPassport Hdd ?

[XPcentric]

I have an external MyPassport (WD HDD), and it has two partitions, FAT32 and OSX default partition. I checked with Disk Utility and its written S.M.A.R.T not supported.

I would like to know if there is any way I could find the health of this HDD. The reason why I can't is it because the way it is made or because I've done the partitions ?

Regards!

 

[hokan]

S.M.A.R.T. support shouldn't be related to the number of partitions or the filesystems used on them, as S.M.A.R.T. is a feature of the actual HD/SSD.

But there appears to be a number of scenarios when access to this information may not be available:

Depending on the type of interface being used, some S.M.A.R.T.-enabled motherboards and related software may not communicate with certain S.M.A.R.T.-capable drives. For example, few external drives connected via USB and Firewire correctly send S.M.A.R.T. data over those interfaces. With so many ways to connect a hard drive (SCSI, Fibre Channel, ATA, SATA, SAS, SSA, and so on), it is difficult to predict whether S.M.A.R.T. reports will function correctly in a given system.

Even with a hard drive and interface that implements the specification, the computer's operating system may not see the S.M.A.R.T. information because the drive and interface are encapsulated in a lower layer. For example, they may be part of a RAID subsystem in which the RAID controller sees the S.M.A.R.T.-capable drive, but the main computer sees only a logical volume generated by the RAID controller.​

http://en.wikipedia.org/wiki/S.M.A.R.T.#Visibility_to_host_systems

 

[MorphingDragon]

It depends.

Most extenral HDDs simply implement the mass storage commands for USB, which is a subset of the storage commands of SATA drives excluding SMART.

Only really high quality drives will implement the full available set of storage commands over USB.