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Consolider Gallego. Renovación 2011.

CERN User Account Management.

Imaxe institucional da USC e outras cousas.

Search tools for scientific articles and publications.

European Committee for Future Accelerators


Proyectos del Plan Nacional. Solicitud, justificación y seguimiento.

Cursos. Conferencias. Congresos.

Software languages and utilities. Documents. Manuals. Online Books.

Web of Knowledge MPI

La FECYT ha incluido un nuevo servicio de valor añadido en el portal de acceso e información de la Web of Knowledge. Mi perfil de Investigador es una nueva herramienta, que va a permitir a los usuarios realizar informes bibliométricos sobre la producción científica de los investigadores, de un autor o varios autores, a partir de las bases de datos de Thomson Scientific.

Boletín de la Real Sociedad Española de Física

9º boletín del portal, dedicado al mundo de la Física.

Elección de un portátil ligero.

Correctores ortográficos e outros recursos do Servizo de Normalización Lingüística da USC.

About bad sectors (blocks) in a disk.

Disk drives store data in blocks (sectors) of 512 bytes. Each 512 bytes has additional bytes appended to it (usually 40 to 60) which are used internally by the disk firmware for error checking/detection and correction. These are called ECC bytes.

Sometimes the data in a sector gets corrupted. This can happen because a speck of dust scratched the disk, or because the disk was powered down while writing data to that sector, or for other reasons. Usually the ECC bytes can be used to correct the corrupted data. However if the ECC bytes are inconsistent or can't be used to correct the bad data, then the 512 bytes of data are lost. Such a sector is called unreadable or uncorrectable.

If your disk has an unreadable sector, this means that some of your data can't be retrieved. You can force the disk to replace the unreadable sector with a spare good sector, but only at the price of losing the 512 bytes of data forever.

Disks with uncorrectable sectors can often be repaired by using the disk manufaturer's 'disk evaluation and repair' utility (see previous FAQ entry). Beware: this may force reallocation of the lost sector and thus corrupt or destroy any file system on the disk. See Bad block HOWTO ( for generic Linux instructions.

Normally when an uncorrectable sector is found, the disk puts this onto a 'pending sector list' to indicate that it should be replaced with a spare good sector. However this replacement won't take place until either the disk can read the data on the bad sector, or is commanded to write new data to that bad sector.

CERN LSF batch status.

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