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Hard Disk allo Stato Solido: confronto generazionale

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    Hard Disk allo Stato Solido: confronto generazionale

    Due diverse generazioni di "Hard Disk allo Stato Solido" (beh... uno dei due non è esattamente un SSD ... ma per essere solido è solido -e pure pesante!-) - capacità: 57 MB (a sinistra nella prima foto) e 1 TB

    20160210_180639.jpg20160210_180706.jpg20160210_180721.jpg20160210_180745.jpg20160210_180759.jpg20160210_180814.jpg

    Alcune informazioni su quello più datato (e di dimensioni più generose ):

    "ST - 157A

    UNFORMATTED CAPACITY (MB) ________________57
    FORMATTED CAPACITY (26 SECTORS) (MB) _____44.7
    ACTUATOR TYPE ____________________________STEPPER
    TRACKS ___________________________________3,360
    CYLINDERS ________________________________560
    HEADS ____________________________________6
    DISCS ____________________________________3
    MEDIA TYPE _______________________________THIN FILM
    RECORDING METHOD _________________________RLL (2,7)
    TRANSFER RATE (mbits/sec) ________________7.5
    SPINDLE SPEED (RPM) ______________________3,600
    AVERAGE LATENCY (mSEC) ___________________8.3
    BUFFER ___________________________________2 Kbyte
    INTERFACE ________________________________AT BUS
    SECTORS PER DRIVE ________________________87,360
    TPI (TRACKS PER INCH) ____________________824
    BPI (BITS PER INCH) ______________________20,280
    AVERAGE ACCESS (ms) ______________________40/28*
    SINGLE TRACK SEEK (ms) ___________________8
    MAX FULL SEEK (ms) _______________________ /70
    MTBF (power-on hours) ____________________150,000
    POWER REQUIREMENTS: +12V START-UP (amps) _2.0
    +12V TYPICAL (amps) __0.35
    +5V TYPICAL (amps) ___0.9
    TYPICAL (watts) ______9
    MAXIMUM (watts) ______29
    BUFFERED STEP PULSE RATE (micro sec) _____3-200
    WRITE PRECOMP (cyl) ______________________N/A
    REDUCED WRITE CURRENT (cyl) ______________N/A
    LANDING ZONE (cyl)________________________AUTO PARK
    IBM AT DRIVE TYPE ________________________36,(or 14, 17 or 21)**

    *ST157A-0/ST157A-1

    Possible translation: 733 cyl, 7 heads, 17 sectors = 44,660,224
    Possible translation: 1024 cyl, 5 heads, 17 sectors = 44,564,480

    Note: A "custom" or "user-definded" CMOS drivetype may ask for a
    numerical value for the Write Precompensation cylinder and for the
    Landing Zone cylinder. A basic rule-of-thumb for drive models that do
    not require the old Write Precomp technique or a Landing Zone because
    they are Auto-Parking is to add 1 to the cylinder value being used. As
    an example: If cylinders equaled 820, then both Write Precomp and
    Landing Zone would be entered as 821. Some BIOS will convert this to
    65535 or -1, which are functionally equivalent to "none (not used)".

    ** MAY REQUIRE FORMATTING AND PARTITIONING SOFTWARE. ALSO, CHECK TO
    SEE IF YOUR CMOS SETUP HAS A "CUSTOM" OR "USER DEFINABLE" DRIVE TYPE
    AVAILABLE.

    PHYSICAL/LOGICAL equivalent to NATIVE/TRANSLATION

    WARNING - Already low-level formatted at the factory.

    Since a User-definable or Custom translation geometry may be used, it
    is imperative that the values be written down and kept with your
    permanent records for retrieval in the event of CMOS battery failure.

    Seagate reserves the right to change, without notice, product
    offerings or specifications. (6/26/90)
    " ( ftp://ftp.seagate.com/techsuppt/at/st157a.txt )
    Ultima modifica di AlextheLioNet; 10-02-2016, 22:58.
    Alessio "AlextheLioNet" Bianchi
    __________________________________________________ _______________________________________

    "The game will never be over. Because we're keeping the dream alive." (Freiheit, "Keeping the Dream Alive")
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