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2.4 Supporti allo stato solido

Le memorie allo stato solido (solid state) sono dispositivi di archiviazione a circuito elettronico senza parti mobili. Questi supporti sono stati sviluppati dagli anni ��50 utilizzando varie tecnologie. Di particolare interesse nel contesto di questa pubblicazione sono le cosiddette flash-card, sviluppate sin dagli anni ��90. Come supporti di dati rimovibili esistono in vari formati (SD e molti altri), come le cosiddette chiavette USB. Con una accresciuta capacit�� di archiviazione e un importante calo del prezzo, sono diventati popolari come dispositivi rimovibili e, pi�� recentemente, come sostituti degli HDD nei notebook portatili.

2.4.1 Principio di registrazione e stabilit��. Le memorie flash appartengono al gruppo delle memorie allo stato solido non volatili cio�� che conservano le loro informazioni senza bisogno di alimentazione. Le cellule di memoria sono costituite da transistor capaci di conservare le informazioni per molti anni. Mentre la capacit�� di lettura risulta generalmente illimitata, �� stato calcolato che in scrittura/cancellazione possano arrivare a compiere da un minimo di diverse migliaia fino ad un milione di cicli. Data la loro relativa resistenza agli shock meccanici e ad una vasta gamma di temperature, in origine vennero impiegate in ambito militare.

Riguardo alla loro aspettativa di vita, non esistono ancora stime realistiche. Si tratta di un dato per�� di scarso interesse fintanto che i prezzi saranno significativamente pi�� alti di quelli degli HDD. Questo li rende ancora poco interessanti per una archiviazione a lungo termine. Nonostante, generalmente, le memorie flash abbiano dimostrato la loro solidit�� per l��archiviazione a breve termine, soprattutto per conservare registrazioni anche in condizioni avverse, �� imperativo non affidarsi ad un unico supporto ed �� necessario alla prima opportunit�� copiare i contenuti su un'altra piattaforma di archiviazione in attesa di poter attuarne il trasferimento su un sistema di archiviazione digitale sicuro.?

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��Who else could get the emeralds?�� persisted Sandy. ��Dick!�� Sandy turned and gestured, pointing. Larry had no trouble following the boat with the white beam as a guide. ��We aren��t doing anything about the mystery,�� stated Sandy, wondering if that might be the plan��that this man had come to try to pump news out of them. If so, Sandy was determined that as long as they had given up, been given up, it did not matter if the man knew it or not. Sandy, watching his friend��s face take on an eager light, a look of longing, decided that Mr. Whiteside could not have found a more certain way to fascinate Larry and enlist his cooperation. In less than an hour the troop was ready, the men flannel-shirted and gauntleted, their soft felt hats pulled over their eyes, standing reins in hand, foot in stirrup, beside the fine, big horses that Crook had substituted for the broncos of the plains cavalry of former years. Down by the corrals the pack-mules were ready, too, grunting under their aparejos and packs. A thick, hot wind, fraught with sand, was beginning, presaging one of the fearful dust storms of the southwest. The air dried the very blood in the veins. The flies, sticky and insistent, clung and buzzed about the horses' eyes and nostrils. Bunches of tumbleweed and hay went whirling across the parade. The genius of Lord Stair was anything but military, and soon led him into a dilemma. Instead of waiting, as he had first determined, for the reinforcements of Hessians and Hanoverians, he advanced up the river, with the intention of drawing supplies from Franconia. He advanced to Aschaffenberg, which he reached on the 16th of June; but Noailles had rapidly followed him, and adroitly seized on the fords of both the Upper and Lower Main, thus cutting off Stair both from his own stores at Hanau, and from the expected supplies of Franconia. At this critical moment King George arrived at the camp, and found Noailles lying in a strong position, and Stair cooped up with his army in a narrow valley between the wild and hilly forest of Spessart, which extends from Aschaffenberg to Dettingen and the river Main. To render his case the more desperate, he had quarrelled with Aremberg, who had let him pursue his march alone; and Stair now lay, with only thirty-seven thousand men, in the very grasp, as it were, of Noailles and his sixty thousand men. CHAPTER XVII. IN THE HOSPITAL "Where are you goin' in sich a devil of a hurry?" the teamster asked. "Smell a distillery somewhere?" It was their regiment��the 200th Ind.; it was made up of the same companies, with the great majority of the men the same, but it was very far from being the 200th Ind. which crossed the Ohio River in September, 1862. RE: Your memo May 15 But for a Private Man to raise a toll, "I'm sorry," he said in a low thick voice��"I'm sorry I interrupted your��crying." "Caro, I'm going out to see the gates burned. I expect I'll be back before Ben is, but if I'm not, tell him where I'm gone." "You're sure that's Albert?" asked Reuben, though he really did not doubt it for a moment. "By my faith, the knave is bold to thwart me thus." "And I will tell you, John Leicester, that if it is my will which is to decide, we will have no king but one; and that one shall be Richard. And that all lawyers and escheators, shall lose their heads��aye, by St. Nicholas! and that before four days are gone, the laws shall proceed from my mouth!" interrupted the smith, rising from his stool and striking the table violently with his clenched fist. "Not see me! then, by the green wax! I may be cheated; for one can hardly ask the king for money to his face." HoME ��ţ ENTER NUMBET 0017
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