add descriptions of attributes 188 and 184

[agapon]

This article says that attribute 188 is "Command Timeout":
​http://en.wikipedia.org/wiki/S.M.A.R.T.
"A number of aborted operations due to HDD timeout. Normally this attribute value should be equal to zero and if you have values far above zero, then most likely you have some serious problems with your power supply or you have an oxidized data cable."

It also described attribute 184 "End-to-End error"

These attributes are reported for Seagate 7200.12 disks:

START OF INFORMATION SECTION

Device Model: ST3500410AS
Serial Number: 5VM0NB43
Firmware Version: CC34
User Capacity: 500,107,862,016 bytes
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: ATA-8-ACS revision 4
Local Time is: Mon Sep 21 15:29:24 2009 EEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
...
184 Unknown_Attribute 0x0032 100 100 099 Old_age Always - 0
...
188 Unknown_Attribute 0x0032 100 098 000 Old_age Always -

4

...

[Christian Franke]

r2928