Pérdida de Datos y
su Recuperación
Estas son las razones más frecuentes
para la pérdida de datos:
1)
Re-iniciar los datos antes de salvarlos
2) Problemas técnicos con el propio registrador
3) Utilización de Shuttles o HandCar con baterías bajas
La siguiente sección trata la pérdida de datos y sus causas. También trata
la manera de recuperar datos perdidos, y cómo evitar las situaciones de pérdida
de datos.
Los datos sobre-escritos por otro
archive en ocasiones se pueden recuperar
HOBO Pro series loggers
have a feature called archiving, which makes it possible to retrieve up to
seven previous datafiles. See HOBO Pro User's Guide
for more information. HOBO Pro series loggers are the only Onset data loggers
with the archiving feature.
If you are not using
a HOBO Pro, it may be possible for Onset to reconstruct an overwritten or
corrupted data file for you. We can recover the data in those instances where
you have clicked "Start," and then stopped the logger soon after it
started logging new data. Data cannot be recovered if the logger is started and
allowed to log through an entire new deployment, because the previous data will
be erased.
The best case for
recovering old data is if it has not been overwritten. However, if the majority
of your previous datafile is still stored in EEPROM,
we can in most cases create a new header for the datafile
and restore a significant part of the data.
Para
recuperar un archivo de datos parcialmente sobre-escrito, se precisan la
siguiente información:
1. Exact start date and time of overwritten file
2. End time of the experiment, if available
Using this
information, we can usually open the logger's file, cut out the new header and
data points, and save the previous data by adding a new header. This data is
only as accurate as the information provided to us. For
example, if you estimate a launch time of
Sobre datos que faltan, datos
corrompidos o que no se pueden recuperar
Complete data loss
does sometimes occur due to logger failure or user error. To obtain the best
results from our technical support team, explain clearly and with as much
detail as possible the circumstances surrounding your data loss. Our loggers
store data in EEPROM, which retains its memory even if the logger stops or
loses power. If there is no data on the chip, we will work with you to prevent
the error from happening again.
El uso de Shuttles
o HandCar con baterías bajas entraña un riesgo de
pérdida de datos
The Optic Shuttle
(not HOBO Shuttle) and the Palm™ handheld running HandCar
software do not have EEPROM memory. These products lose data if power is lost.
If you have important data on an Optic Shuttle, and the batteries seem to be
failing or the lights are always "on," send the Shuttle back to Onset
as soon as possible. If we do not receive it before the battery fails, files in
the Shuttle will be lost. Call Onset to receive an RMA number, and ship the
Optic Shuttle overnight if possible.
The HOBO Shuttle
has EEPROM memory, but using it with low batteries can corrupt the data files
and result in the data being unretrievable. Be sure
to replace the batteries when they get below the recommended minimum levels.
Users of Palm™
connected organizers should read the product manual concerning battery life and
battery replacement procedures.
¿Qué tipos de
recuperación/reconstrucción de datos puede realizar Onset?
In many cases,
Onset can retrieve data on the following product lines: HOBO, HOBO Pro, StowAway, or Optic StowAway data
loggers, and the HOBO Shuttle. There have been cases where a logger has been
struck by lightning, and even blown up with dynamite, and the data was
recovered intact.
Onset can also
retrieve data from loggers whose headers are scrambled. This is usually less
successful because the header information is what enables the logger to record
data in the first place. If the header is scrambled at launch time, in most
cases the logger will not record data properly; but if the header was scrambled
at Readout or during deployment, data may be recoverable.
In some instances
we can recover data from Optic Shuttles, if we receive them before the battery
goes dead.
Correcting a datafile's time information is also possible. This condition
usually occurs when the host computer's clock is set incorrectly, causing a
logger to be launched with an incorrect time.
¿Qué tipos de
recuperación/reconstrucción de datos puede realizar el usuario?
If you have a
multi-channel logger and you accidentally select the wrong sensor during
launch, the H08 File Converter can
change the input device listed in your datafile to
another one.
If you have
additional questions regarding data loss or retrieval, please contact your
Authorized Onset Dealer.